Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eecd69696f40db…

MALICIOUS

PDF

133.8 KB Created: 2021-09-02 16:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69937b1f3db7ccbc572a2ebe88db7477 SHA-1: 694d9d836719eafac61fcb2135f3cadf010286a2 SHA-256: 86eecd69696f40dbc4fd38d81eb19092ea457bdbbbf50fd93319060454951f25
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e360ad2f0---64554983694.pdf In PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/93199839736.pdfIn PDF document text
    • http://skinanniversarymall.com/userfiles/file/5820112907.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/0mvrl5ackg2rvl8nu7m8otb2u0/64121017072.pdfIn PDF document text
    • https://castel.ro/userfiles/file/35202372672.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/74466798671.pdfIn PDF document text
    • http://18554080.com/userfiles/file/18501884399.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/polemugemeranoti.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ufhcet2je9g2vkp507edei2j46/liguzofisufinajukajerixe.pdfIn PDF document text
    • http://yuli-china.ru/d/files/kadamamureni.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/lorunuzexogitakogadobovo.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/5061917954.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160823a0797308---45840134545.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/48414189927.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oj1s5bndld2o1guctjmumtgokg/vapedo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab988ae1333---24547250516.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/sewidaloxe.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/72956611144.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/p9b16ot0g7ctfprv84c19lmj66/56318258896.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160debf8d96a9a---sezix.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/39025549617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pirate+adventure+oxford+reading+tree+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_off0001a353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A353 10728 bytes
SHA-256: c0683f684eb84182c01897bb7e756fac34a77e8942e7514fa006c0806c62571e
font_01_sfnt_off0001bbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBEC 20104 bytes
SHA-256: 84b7707a95b69f0876a218d06475b185c0589624383d91bc9a754793748f1671
font_02_sfnt_off0001f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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