Malicious PDF — malware analysis report

Static analysis result for SHA-256 344fb896be67716d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 14:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aaf44495075e6a04935a93ecbddb1781 SHA-1: 0542e632ef318cb98220d5452c61819f377a9818 SHA-256: 344fb896be67716d5838cd4385009a01b6aa4ce4a56bcf912d7b758b08e992ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links for SEO manipulation or to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://textingrights.com/userfiles/files/kavagisim.pdf In PDF document text
    • https://handientu.vn/userfiles/file/69644332208.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/vifewuwiwifuluveseg.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/ganitomoxexoredevugazes.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/84f57e01f10623b1ef54a1e74e7c3c3b/34483284774.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/661ab3badcbf9147bd963fe41fde468f/57656644231.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/zosesodibakuvesezunerixu.pdfIn PDF document text
    • https://bataretak.com/img/files/file/61309178759.pdfIn PDF document text
    • http://cocoal.com/uploads/file/xodudinipodusurizerofe.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wugejot.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/28002931452.pdfIn PDF document text
    • http://esteel.my/userfiles/file/vowaturitaluxosuxepele.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/kunuzebi.pdfIn PDF document text
    • http://zubrcup.by/files/files/perufegeliroviguwez.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb926ac456---84564959512.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/18325811154.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de7fdc1f4---53602192092.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a314a460241---77490586124.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/gomojejobanujora.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/71793066187.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9dc60c304dad5cfce77ad025bc77abe5/48456663323.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/jagerogudelumewigiza.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ca92fdbc---88264181457.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/tovuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=synchytrium+endobioticum+pdfPDF 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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 10940 bytes
SHA-256: 84377b97115a25542b01ee15c1eea86f601acb447d85f654a4a8407838d7f0c6
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 19588 bytes
SHA-256: b00e1dd071fdf048c27ab1f212b4095d1b25af06224d427774158e3dc0e7e9a7
font_02_sfnt_off000129e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1