Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dfd1db8e6801a3…

MALICIOUS

PDF

84.0 KB Created: 2021-07-04 19:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32154b71880ec72500cfb131a6d66eaf SHA-1: 5e21448c2f6eb00deba457889e58d80b102ddf5b SHA-256: 31dfd1db8e6801a323a570fd610792b1b51d48bd2ff196080e6fd82d71edee9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV specifically identifying it as a phishing trojan. The embedded links suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80ca715c9---vemakovapit.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/kexokajafafemadozidiliko.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lgfbq7077lvdh8e41vk3hu9s7m/15770569529.pdfIn PDF document text
    • http://simonide.org/userfiles/file/gimoligusojesiwudil.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/899accebea4cc0e79dcd309ce5bcd94b/simoxekivibabu.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/82556456829.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f697120b---pebekejuzujagidonawidel.pdfIn PDF document text
    • http://short-story.ru/upload/file/28346632081.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdac161e24---47886279386.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06392845f---42442038765.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160974f848b2e0---zesemumijev.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/h4klqcn4128nqesbe3srtol9sn/56923637033.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/upg3ao1uig11m8sc971qkeka3e/77481866362.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/56489585aae8268f588426dd96421cc1/zogaga.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604223755287419.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3fbef86ff50b39a65ab07388a254948b/1843314265.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/virevepadojasafujegazojur.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/fajikuzijip.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b61fe35489c---tafaluledimuvulesuj.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/73578232.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/ferukikokugijuda.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/munivajagogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ovarian+neoplasm+meaningPDF 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_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 16752 bytes
SHA-256: 4a2d2707049ea9aded0028fc9bfb96f13e244c4d36bcda47f3f3b53d59629afa
font_01_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 10588 bytes
SHA-256: e669117e6e2c248f6969f7147ec508c491c134f8812196d4df65563334041fc6

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