Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5db034f14380df…

MALICIOUS

PDF

91.1 KB Created: 2021-07-03 12:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39bb30055d6437c3975200d65109a880 SHA-1: 441f7342843e69f008a01fe98470c8f7856881a9 SHA-256: 2c5db034f14380dfd1276a51f08d3fc8d1cf3fd9662702f1ac45beb9ab4cf3d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dabbd663---37877029121.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160775d0aa9e0c---5450472984.pdfIn PDF document text
    • https://patc.fr/imagesfile/zenuxedovavivujipajad.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb9ac3d40---zekafotisawemovobuwawiw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/500dd0e536bcc5510af19044f49f6019/wupogefofuwebezirazorikog.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mubofafo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/52cb08dec41141516f507f7039401acf/83083025862.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078474eee892---bogosagubafimesovaxusi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e012d4b2.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c991549d6aa---67988041895.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ec420fd1b3dee6fdf636d91c2e9405de/lejadegojamebu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/89802656339.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081efd1b8378---nisakilotomedabawere.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/f0ut7tgevjili3bodcjdbrfood/65697738236.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab5a8416f---fevix.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8cd2cb8f---patikagarotojo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/vgj9cjspr7kiegi5p4tniklb58/kogunusilipamixazetari.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/930aa8045f34d3c445395e7932a5eef0/rimaforuzovosipax.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16077a195ed66f---samagipefitiji.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/59a7db97033deb79617e68e4c850f867/43065216798.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fe1d7e21c---19495647183.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/vavimubalitabar.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce31f826686---68888361979.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/11501a5b29a566fff85233722fcded4f/22250693343.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/081ft43dcsi5pml39ug9flmgvi/9098096755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=word+and+life+theology+schoolPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 10864 bytes
SHA-256: f48c81c14fd3d7415d66d8ee757822ca79aafa61f21a1481844c04ae545443e8
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16396 bytes
SHA-256: 187595f0fdda8b070cfab1f56b3a62d918c623a7306cb102046ca9fe186a106e
font_03_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 17116 bytes
SHA-256: ce3d119588d92242d34b2b629a18b4f08b578983d4b9af3ff75787b08ade03cf

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