Malicious PDF — malware analysis report

Static analysis result for SHA-256 503f67bbd6626d5f…

MALICIOUS

PDF

85.2 KB Created: 2021-07-30 22:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2adb08951efbe69fe3b3f019b61e180 SHA-1: 603ad6d41224e285ade8c00a8462643db2f26980 SHA-256: 503f67bbd6626d5fae43974cff69604192cda3db80f10b370cb4e8f954089430
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://agataklimowska.pl/userfiles/file/relofelogetexibovib.pdf In PDF document text
    • http://hyundaiokla.com/uploads/files/kitexutuw.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/17906695987.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/sudoje.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c27435f35b6cf167fc930f69e4f272c6/31161843890.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/68724183470.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/064bf2ccb4c76e2fc983fdfdcf76a1d8/91075974818.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771bb57e18e---sikawevudopixetaposizez.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9e5d705a0233e9a058ad81ac2b4b36cb/85569827070.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/92019163715.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/favifegud.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/gozaxavofilafebatipaba.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/nalobiveperak.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tan44ck0qq2qcjf6j79fe654d7/dijov.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898e4175229---23241685966.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9ovgeggt1p4sdpedt4eldnung6/77137012173.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/62084698311.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abfa52a03b---69339332234.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/48acb35e8e76f4ffdfae3fbf05b61772/55947985533.pdfIn PDF document text
    • https://t2sc.me/userfiles/zexobewawemibidadawupu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f85ff5ba463168b1986ae1e3de333c00/43852665672.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fppf372p65be6dfmtbu9uc05fg/11675898501.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dada8fb4e---vefuvewonot.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbf9c1d39---bapifi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e24d96d545fe546ed4167b208a52e07b/9233344370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=car+simulator+2+hacked+apk+downloadPDF 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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 11208 bytes
SHA-256: 3c6f85703f58f10affba09b68ef9569c228a0583296c9bb6349099f63cd2f1bb
font_01_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 17468 bytes
SHA-256: cc1e498dbff62832998a22a67793ded8aa13fee747fb4043ee1800d682701e44

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