Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e01ce77970a7dca…

MALICIOUS

PDF

95.4 KB Created: 2021-10-05 22:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fafb4e4d057abc4f2f408fd6b14ca7cb SHA-1: 84670facbae9fe38ff6b8a776b81e08de7b3c3ac SHA-256: 7e01ce77970a7dca9cbc8887de4a823392447fa135eecbd6e21d52ed626c1904
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=icd+10+cm+code+for+right+leg+pain PDF link annotation
    • https://wojczak.pl/userfiles/file/legogeja.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/97882877492.pdfIn PDF document text
    • http://mylead.mandiricareer.net/contents/files/fevol.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/tefovekisazizudulimibalet.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/29958091716.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/39563620539.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/92440388395.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/33319424778.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/genotujadewivaxevuxegobes.pdfIn PDF document text
    • http://bankerz.in/qpic/files/sepefojananipidiku.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/maxumoli.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/75679136817.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/lazizivubadame.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/988321117.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/mojuregi.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/14527300817.pdfIn PDF document text
    • http://mylead.mandiricareer.net/contents/files/jaxaleruvejukaro.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/dodazogu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/38615118401.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0bf3acd2c---jawaronixud.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cbaebb092---jinitoviwexadabomo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9b704f20---tefetupe.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/razexijevogiru.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/bawanerosanime.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/furebodakofaragabodar.pdfIn PDF document text
    • 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_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 11024 bytes
SHA-256: fbcaf6bccd08787fc36c68288fe64530bf19b9447040797246a6f60c0db6f3dd
font_01_sfnt_off0001262f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 18900 bytes
SHA-256: 3d3887a38cea205643a8d3026b1fadad3fecffdc9dfbcbec4436ceab6a5e6fbb
font_02_sfnt_off000156f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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