Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8726bc4c76d2d8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 13:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7badc8e167740a6c82d30e602618e78b SHA-1: e2eda4eb833099fef1468d549fa322790f1293e2 SHA-256: 7e8726bc4c76d2d88367a7d24ec1c2424877f93cad1648f5f3f0d4a009a2f286
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of external links, many pointing to compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=games+of+play+store PDF link annotation
    • http://terrietanaka.com/library/files/64104941743.pdfIn PDF document text
    • http://lex.tj/img/file/lusakazag.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/43305787062.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/24209866363.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/41924261837.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/54415705715.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/22748161921.pdfIn PDF document text
    • http://medica-brno.com/files/88617450289.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/garalijaxamalovo.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/78211206048.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/fuvapiredatifeko.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/vopodeferakobeluxixewukuz.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/29022353461.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/90203805844.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ce7c6ba831e16a0fff946e800c9c737e/bidokeraridevixa.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/10748878538.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65fa03590---34568640912.pdfIn PDF document text
    • http://watch62.ru/files/files/tojisopeluwamerakidetor.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049335a7c3---gerosutejarave.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/lomebewobugokosobilekez.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/zanovep.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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 18164 bytes
SHA-256: 425cfb834806caa872cb353d48d41d0bf92bf7757f71fbe41f1f3920edd4ba07
font_01_sfnt_off00011998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 10476 bytes
SHA-256: 067dad62ce27b227a7147591c327ec64a2ec47bbd26b1c5a47513068cc3c7c34
font_02_sfnt_off00013188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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