Malicious PDF — malware analysis report

Static analysis result for SHA-256 34fc635be50f70ff…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 09:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb52ffcc0c1cc536eb3c3a5bea657071 SHA-1: 57f871e4391fc1736b367fc8c34f3ee738b9ffb9 SHA-256: 34fc635be50f70ff5cd8748459fbba8b3a0a25c12e1e64284cae622735e609da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. This structure suggests the document is designed to act as a link farm, potentially leading users to phishing sites or further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c02eacca1fc---wogiwawutivumapipilaj.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/81228243880.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160850ac867c6d---bubipakawevabezepegonot.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0fc61145---tiragegupovexodogobizi.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1b6da64cc---sowemitosazedaroxubisej.pdf
    • http://dnepropress.net/files/file/17484830212.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9291ece2f---jezixofab.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3qohg1n2m0arqsqvbkkcu6ci26/mizigosuduvozagujoz.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/e7c7b338ec74e27386697a0227e134e1/gemopepunuzogikikop.pdf
    • http://budohurtsa.pl/userfiles/file/5464316056.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aaa15a6f6---67242883319.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/42634141a24cfb198bdf6f1f3577cb68/37736396521.pdf
    • http://nexxosrealty.com/userfiles/files/51423485469.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5eb24b91767f4c2d4914c7578dd8e817/87570865592.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/ba3e4e44b5ca9ad108ba2809daf81b29/37589961559.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4bc65f1b4c0cb46b3f58e186f0a35c4c/tofezodew.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cea50a15b14d89ac9170354f4781e383/33780549736.pdf
    • https://reniuved.it/file/57734474088.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079763b46f89---notamidujavufi.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d0a13a135beb0229b960045395c8232a/73323816358.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee061b6fbe---jadetajifawejevogad.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68b2afc7b---3505712475.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/gurewaxefif.pdf
    • http://hitecds.com/userfiles/file/nonide.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/dibubujisepudejazokiru.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa1686ff8---64740548124.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4848831015---78808807705.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=history+class+11+chapter+1+pdf
    • 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_off0000f9d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 16792 bytes
font_01_sfnt_off000111e2.bin
3632a8f6758e173e0082d84709f6d5ff9ec72b044075051519840358b339a3d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 17400 bytes
font_02_sfnt_off00013ecb.bin
5f06267387bee07f4380e24ab103fc48144cd442495ac41b34478ca690df4698
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 10772 bytes