Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0c2e6641e8351f…

MALICIOUS

PDF

90.5 KB Created: 2021-08-30 10:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 17167e4b97ae5bd7d200193e7404f0ed SHA-1: 0c820cc39d645c2628790fa78603848b188c5acb SHA-256: 1a0c2e6641e8351f6202fabb0861efa99faab168ef5920addcca9ff4ac95c824
104 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress sites. The presence of a 'download button' lure further suggests a phishing or social engineering attempt. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/add34b63add9affcc8ef9844d61e7b9a/fozofujolokizakivuweb.pdf In PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/71920839891.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/43feca53288967b3a5511aa282996ab2/sebukalafogejejonafumuxel.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pededekiwukopemixi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/53686710456.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/jkgnttt7k6ad3r26i2m1s4sh3p/jutofonejupumofi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d5bd1dfd9c513544d4c18385e5f0a6d2/37566505538.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608156c1c1169---75971983314.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d855c7e647---limonujenigumazaromo.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/68525524327.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b69e70b459c0c40797b55b2553d6fa9c/17137587970.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d6743e1b6---36343244112.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pogibijaxeletasomum.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/64711004262.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/ribaxujotunewexaravebukup.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a0dbcd7aa---posax.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a2a96e34---69935491689.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/babagidofibawotafusufiko.pdfIn PDF document text
    • https://emprenderem.cl/files/lumavik.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/58616593473.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800baf080da---42382209906.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f171c51e41fc7ab23ab57031aa2a094b/74432503232.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sibawagimolorufuwujaz.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gesotuwabib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ugc+net+paper+1+previous+year+papersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 17820 bytes
SHA-256: 5a907fe2e42a2acbd43a2d4a9947e1dfc9f86baa38c2920c98e0825a5ac5ac89
font_02_sfnt_off0001419c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419C 10844 bytes
SHA-256: 25bb423b3e0de0b9c325dc2fd5e618843e43973d28ed6099c9b43d7d4346b302

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