Malicious PDF — malware analysis report

Static analysis result for SHA-256 61353a5479020911…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 08:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ef4644779461d879c2c0fbc3d0eb4cf SHA-1: 3b55cd297dab3e4fc5cd50ff40f76be83137212d SHA-256: 61353a547902091125cae9f8ccd1eef2d009a45fdc4d3c57b7e12626b7264bfe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing attempt, where the document likely prompts the user to call a fraudulent phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit user trust for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/86apgu01b5nh00u9ghv163lhac/moxojiwinevavugilutewa.pdf
    • http://home-plast.ru/foto/files/tigubemumekepazofapadodef.pdf
    • https://raljob.com/userfiles/file/91724853424.pdf
    • http://inimtrento.it/userfiles/files/94913944587.pdf
    • https://granitabrasive.com/editor_up/senifenulogapisale.pdf
    • http://zussobrance.sk/grafika/dokumenty/nekewebuvonavexobusofa.pdf
    • http://apluskleaning.com/admin/images/file/88063072737.pdf
    • http://hightopeducation.com/cms_uploaded/file/gavevigapuperi.pdf
    • https://huanghecables.com/d/files/74731460029.pdf
    • http://kronospan-mofa-hungary.hu/editor_up/46724795230.pdf
    • https://cobrawire.com/userfiles/files/sikizufazijanerov.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140181aeabbb---gudoguzibelijavomozokox.pdf
    • https://cobaltinc.org/userfiles/file/10848132938.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/xubal.pdf
    • http://irpuyesh.com/cache/fck_files/file/siluguvisanazuju.pdf
    • http://ottomaniantextile.com/userfiles/file/potaxevotupax.pdf
    • https://jhservice.net/imagenes/galeria/files/vaxaxitogazokebama.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/be58118767cb5a29865d194b670970fd/luditufevumufetiz.pdf
    • http://wsm.hk/images/uploadfiles/file/66822190208.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/memalawi.pdf
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/pixubamigolemige.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+setup+an+email+account+on+my+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48e.bin
adbdedba7ad9b0b375e195a7a2cab535e67bb8973286cf53d4d9fd977457e9bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 10968 bytes
font_01_sfnt_off0000eddd.bin
e8a2b4a5e7422ef707b392eb12bdfd2fe5837fa2d5f0f5245dfa02b2464d6e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 17224 bytes
font_02_sfnt_off00011a7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 16792 bytes