Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3897eda0058c6d2…

MALICIOUS

PDF

94.5 KB Created: 2021-09-07 02:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81105f03cf920f3f9d15220bf056b88a SHA-1: 7a998dba8b6fb202f535e290252da0c522ec1979 SHA-256: b3897eda0058c6d26d5c462011467c22b494f80267cbe8cefe8ead818ba36e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards an attempt to redirect users to malicious content, likely leveraging a vulnerability or a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://queure.ru/uplcv?utm_term=cambridge+advanced+learner%27s+dictionary+pdf+free PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a909c49ce---48219371624.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14fd81a595---butazezivepumatowuvazodel.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/402c6853552b003b1d249a125b8b416b/kapedinadafini.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/92677556486.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/58018445063.pdfIn PDF document text
    • https://petek.biz/resimler/files/69549768860.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/28611968324.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/46596389576.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/48g3flcqb6ho4qbov8l584d0s1/38994156733.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161261133e2502---rajuromawemoxaxiponajikan.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0ee51cd15---xevenefalopefivulefito.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/25957699576.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5258d2e5a54d760fdb0fa23f853597e3/31975983366.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/363a57d9223597698776e6282ff43ef2/davosokatidirokulajolef.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/31577660435.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/jufamisadanoxalap.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/lutokapagojuxog.pdfIn PDF document text
    • https://casentinoshopping.it/file/bubopixosanubojizuban.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/nosudojavulumari.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d8jq86613an0fd5q5id4tdrhj3/josatit.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/36948237855.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dcee72af3---90052170860.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/zalideri.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 19056 bytes
SHA-256: 387cd06e48b9e37411b6a490410024e46825a7f19f0f185600e6bb25c08e6b07
font_01_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 11348 bytes
SHA-256: 1b818a81213982fe51e276a73f724706cf1faa5756526a8bba2f4085c3304247
font_02_sfnt_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15085 17668 bytes
SHA-256: d8f78515741cf98284d255faf081cc0731ea9b93a5947afb190f051b1bf7822e

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