Malicious PDF — malware analysis report

Static analysis result for SHA-256 c062c246d5ea2b7d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 16:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e36f2c477a10479f0ba890236f5c3d7f SHA-1: c2b885b63970321e2a09f5c07b9fde56bdfc8259 SHA-256: c062c246d5ea2b7de7baf54ff0deec873f9674a3700acef7249acbfb648e3f8b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload storage and other unknown domains, suggesting it functions as a link farm or redirection mechanism. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161434add43cd7---82391638986.pdf In PDF document text
    • https://ozsersogutma.com/upload/files/52365780077.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/85839598999.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/kobofu.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/lobamidalemizimugefomiv.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/lapotonux.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/41850616200.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-9/20210909054740258208.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/buroferipuguxisiwodo.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/35560642966.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/vezelevab.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf93cdda6---letapipor.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/22347750517.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/temow.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/lelajedopenumozalolu.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/50136631599.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/vasotagixom.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/livasaxa.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xezasepekaw.pdfIn PDF document text
    • https://servicepapik.ro/files/79489718372.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/pinatufebub.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614505f78ec21---fatalibamokafugu.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/96858690013.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/jerevevi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613176080a362---kebinejixidolewanasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=frequent+headaches+and+dizzinessPDF 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_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10584 bytes
SHA-256: a3a1a6a7effc67b05b9e7f49ec770bfcea36df0d3c34d08fa3843f9edc3acebb
font_01_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 17660 bytes
SHA-256: 64899bc227a90e9c4c5274618f1a1c932d20b963e56fab3ff513c487ca1bf22c
font_02_sfnt_off00012c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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