Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6a4abfb98a00db…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 11:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 452ae808b1cb5753c2f3d250c4739b60 SHA-1: f2b4f7432515ecfa4f81951147d2217a0fd5f3aa SHA-256: 8d6a4abfb98a00db28b38d3ecceb2d58b6b5ac2212a1f6b3203393ada9368586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document is designed to lure users to external sites. While no scripts were extracted, the structure and URL patterns are strongly indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pistant.ru/uplcv?utm_term=t+mail+apk PDF link annotation
    • http://scard.vn/app/webroot/uploads/files/7493792249.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/81351841147.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/sabanilimuwaxifuwaxupu.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/gasibiko.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/29076265520.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/86853708612.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/12565125771.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/datixidelupolukarajozu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3ffc8728---xojiropewidufovomagug.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613115cc0db09---palufe.pdfIn PDF document text
    • http://axwelindia.com/uploads/69689803219.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/fovofikapodokub.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/fipidozowepoxosezetowekon.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/kofavufo.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/lududiretikigepupobevi.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/27807587058.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebe79df883---20967860091.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bu3re76eti2nuul71967r4r2pn/lajodufumagoregipim.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/80467136020.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/vonopevivoxizeludajudavu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/61156331099.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/55095346764.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/0k74cpt0m4053m27mag8earrcq/bepelodadinozuj.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_off0000b227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB227 16612 bytes
SHA-256: a8160670d8ec86e3766365c22a25ae5da02334e6d67327d496a1e98da932b9cf
font_01_sfnt_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 9744 bytes
SHA-256: 1bbabb3bd57288201e053bed75bb34a58bdd9d6601bbba2f86567097ca54e0d0

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