Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8201e6db3dd0ea…

MALICIOUS

PDF

82.0 KB Created: 2021-08-15 02:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bbc02fb92b6a4b1ba385c6c0a70eebef SHA-1: f251851704e43ca40177d8477ff14d1d53e55943 SHA-256: 3c8201e6db3dd0eaf35f609b741959fc21fd76cf5cfcb027803ade5e43ca782d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/feb80eadf3a31b5996f828529e9bece2/kavonur.pdf In PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3j63s25bec61lqj8puigjqpcf2/sukanatijizuvesujeda.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/lasifij.pdfIn PDF document text
    • http://didula.com/img/file/pexakejer.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/sabedofeferiwaserimi.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081008385873499.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/tiwoketitesu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xoxadulifefitagokelesitu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/10608897821.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/62174597515.pdfIn PDF document text
    • https://seerupit.dk/assens/file/wawibalurodimawaput.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd1252851d---kazifevixopetobefatunabam.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6926bed320da0fddb8e556dd7960dd66/vegumavofenazusa.pdfIn PDF document text
    • http://inistor.com/ufiles/files/nipapibezotomij.pdfIn PDF document text
    • https://le27.fr/docs/file/mizigole.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hjqkdgt9v5ratfk6shma187oq5/2147194806.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/jaresizolulemadijigejex.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/19384060766.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fb7ac1a48---75057895925.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb5949c5d2---17172244699.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e89cc8696ad6d99c83146b0359850ced/temomaboresofonugija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+start+an+online+boutique+businessPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7ec0712cd643e7f5f1034db43a0254c0/96193136611.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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 16848 bytes
SHA-256: 25279d1c9607862f68676bef2a5a41d1a8144803be80e06768c55b7c22430203
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 10704 bytes
SHA-256: bcb6a2ee7f5755a2dc80f1c5b34581296632c52421515a62ebd51f810c4421c7

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