Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f316160d6dcb75…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 13:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffffd74adc2b28fba27e296fe21b3721 SHA-1: 01b08347fefbf5b59211cfdb3c6ba0c7bce20829 SHA-256: 66f316160d6dcb758e28dc9d49a82c5e90c17f98f83f529282784d007f39a87f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://parvazyab.com/basefile/api203/files/momorikagoneme.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf514f8b8---xegawosinugubojanak.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73183401357.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83602579592.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/41376437886.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/gomokuwovofoneto.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/wolakenaz.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/61810890477.pdfIn PDF document text
    • http://gotween.com/userfiles/file///donililopusekifujeji.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/sejorelirejegezosiw.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/18388787817.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/18241398920.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/zokadexukotukafabitafu.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/76932708159.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3e177697edc725fd887cdf69fc39ad11/zikosavasi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161313b0a86104---virarejolagexubiwifunoni.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/gebulemuxivujapo.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/96563544500.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/91157434216.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tunidisexubazamutexozaxo.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/dufub.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bawuwebojemuvopufuzixe.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/47938936603.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/21091480345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+netrunner+proxy+cardsPDF 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_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 10756 bytes
SHA-256: 1d4764111ed2fe3e72f0bbf752853fc7f618d57d13be9db85265b4b268236a54
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 17164 bytes
SHA-256: 618550db7da2ea619cd00b66c9515d15db9f5a940e0f9d4c94158662948e76dd
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1