Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee466a5775e49ae…

MALICIOUS

PDF

84.9 KB Created: 2021-08-30 16:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5993b586ce04160033e2c1ae83add12a SHA-1: 6581da3403ab75534a4069b19bf3f9a99e7a4396 SHA-256: 8ee466a5775e49ae28c58a511484dc23022c4290cce758fda498531d4329c3f0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute malicious content or redirect users. The presence of a callback lure heuristic further supports the phishing attack pattern, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://shsuorui.com/uploadfiles/fckeditor/20210614/file/16236989198679.pdf In PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e80284464---muterujewovikuvatetutu.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/sunododufijosutorudeguful.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/wesujufumikavorubu.pdfIn PDF document text
    • https://hoavily.com/uploads/files/gedajadafafumavigajenilo.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/ruxakodalegobatavijejige.pdfIn PDF document text
    • https://t2sc.me/userfiles/71791388737.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/45189450655.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/abe61388147dcc13810d14493c997cb3/82398426402.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/23758882902.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/tejamixunivowejefaw.pdfIn PDF document text
    • http://qca.ch/userfiles/file/60011621535.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/28902373221.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d60c4f8ab67---reruludogo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f807183b6---batuwerut.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8qv5mh17rvddht291uavg1phf1/18354996280.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/robomuvasexewapovawedo.pdfIn PDF document text
    • http://atek-ent.com/upload/file/66864347616.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/27976201896.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugorepebelizegali.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/2korkbegvomn1fv90ocb41hd59/jagorofa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceaed1cf63---23293641537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=set+aside+time+forPDF 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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 10440 bytes
SHA-256: 84dc4650091d7ebdc010d699095f7fc2e89f39c6e8385269740084d183c6f37b
font_01_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 19384 bytes
SHA-256: 162a511fae7d1a745e000a61d1ecb4816f291ca13a7fea3127239faf6e07693b
font_02_sfnt_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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