Malicious PDF — malware analysis report

Static analysis result for SHA-256 285985120df7ecfa…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 02:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0e99fccdf9d109348592f15e81edf08b SHA-1: 92e11819e92535443c2e5388cfe6cc87b49499ee SHA-256: 285985120df7ecfaae79f6a3e22f00293cc13125dc7acbc9d53f90409708b14a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3acn6f8nqlus7kuvhclgtsss00/vanawulujafekon.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4814a27e---45715061172.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608728519dd44---jomobasajed.pdfIn PDF document text
    • http://keramann.ru/uploads/files/gejexanepavezijozarade.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a21663707c2---71489922578.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3d61714b---fusixosuzipevutago.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d7b5813acf36e2d23cb144031b875b32/29306985667.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88690bec9---wibikuf.pdfIn PDF document text
    • https://susta.vn/userfiles/file/72651767213.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/nj7444f1q5rkthqhq2uer2l871/katotonopabipitufigur.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb116b8057---zilatutivij.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/dogaroriripamerufufapok.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/ridatos.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/601a1349ec6a78783afab47b83d86c2d/fesonexarogipaliduru.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092044908637---90948565931.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992e09aeb09---85853569153.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021542232483551.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/lenewilusegejumotipex.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608098762aae3---zufedovukidurixuxizeg.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/zajawen.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kakatajatonago.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/egner8nht28fqcppfq0kfn3b9q/74136136794.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/17f8422c44427664b79813d06f72b87a/8050715582.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef801e3a1---46326019750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ielts+general+reading+practice+test+2021+with+answersPDF 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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 17100 bytes
SHA-256: 2a2e6707f303aae8490aff7a75551b8e718e766a4010abaf0acc6ee0dd064733
font_01_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 11004 bytes
SHA-256: 4d9b056017b0537db98339c576eff16cc06d2c0ed1d4beae12ecd168fde40a4e
font_02_sfnt_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1