Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f6cb01b2348e0a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 12:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bff4824ef1e919ef4f70e0f92f3a57a SHA-1: 5403570f63c797e66caa113cddd6f72d085a6a0e SHA-256: 42f6cb01b2348e0a15d088db3cd94fa7e23d4e64d952224948aa630b906592a9
156 Risk Score

Malware Insights

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

The file was detected by multiple heuristics and an ML classifier as malicious, specifically flagged as a phishing trojan. It contains a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coumert.com/images/file/fasikukafik.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/besekejopepefigajaro.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/vetewovorixet.pdfIn PDF document text
    • http://contelex.it/userfiles/files/1541917558.pdfIn PDF document text
    • https://maymac.info/userfiles/file/zebazide.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/69157742171.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/124c81ba29d88630383a5544dd75c829/53190136510.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/37587920082.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/goxusi.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/15334819733.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/wipusibud.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fazupumewurabupetexu.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/xudisujenozope.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/70358128673.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/juginekalufarigexelegin.pdfIn PDF document text
    • https://ibericadearmerias.com/file/nasoxopexibe.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/18369935880.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/71611674250.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/6927211831.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a817f881---sobapisa.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/56943335426.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/kiguxurobesovogofamu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614524b0bc07d---vemenawapujenak.pdfIn PDF document text
    • https://majubesar.info/contents/files/tanenivenarovudobejig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=can+i+get+back+deleted+texts+on+androidPDF 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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10912 bytes
SHA-256: b7fecfeb96a82bd220d9256cf1d54ad2310aac228e8879187113dbd39bd6e724
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 18056 bytes
SHA-256: 108c3a94a1c3b7074991051d212d98847fc099e01ca3d846b9c508fb503197f0

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