Malicious PDF — malware analysis report

Static analysis result for SHA-256 a860df3b20293527…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 13:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da867c0b5afc2c72821f9740e0203292 SHA-1: 76d85bc333a271d3bc467bfb0eb69289cee1299e SHA-256: a860df3b20293527cd33e82b831c287189b52d29197de49c195f9e7e3f4658b6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary function appears to be facilitating initial access through phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=como+ativar+o+3g+no+android PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403edfeb674---25202328071.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/jozigufixagipaxifupej.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/10887582302.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/91419030378.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/sajonakaluzopoxolodaboziw.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/merubawoj.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/mudokugeropi.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/piletoxixugalonaz.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/jaramod.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/47762531510.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/jiwugagufitagog.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3d2555d19146fe52b3506c1e7064377/47577467630.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/95540069147.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210909200812.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/6339560199.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/22861949919.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2c7baa06---rilisuvuvasojexefejitu.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/fudimigosurorutefodebuli.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/dotivowixeme.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/mepobijoj.pdfIn PDF document text
    • https://termofriz.rs/files/lujevovigazimelarofotutix.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/ragejaxogenogadazomaxobab.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/30323330437.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_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 17424 bytes
SHA-256: d485068c50c0f13fb9f5e99e2ba228a79a8c3348183621777420a0aefa812fd0
font_02_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 10516 bytes
SHA-256: 2105341a6e9f43bce595e5721bbc05fbefd47ce9aa57516713964739c1d41cc9

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