Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3244f272dc486b…

MALICIOUS

PDF

84.8 KB Created: 2021-07-18 23:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a6b2db4b00e48f039075541ef03b2540 SHA-1: 6a1be3e4feee6ff90bf9322e10c55b8e671ff655 SHA-256: 2f3244f272dc486ba472f0bc7a92c2898ada1ac5244038edd41b62f0a1fbd855
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many distinct hosts, suggesting a phishing or SEO poisoning campaign. The embedded URLs point to compromised WordPress sites, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/tredfimjbnjdgacjm0n6jmac5j/tawogidupenuzefizuva.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e455ad442---24052407925.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6b6f681c1fed7c48c7e698ad1416b8b0/57404461954.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b167a562a7c---8948025138.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4fe47c3cf861d65740c8987b9b6df700/guzisapizuvese.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/43998995478.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540a8767da---8772838593.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/10417651207.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e9775ef6---92076570467.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sd032g46q3cg9mdiqoe9bqv87g/fawaxejufipolif.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/nuco7d17h71d0748olbat1sh1c/wakubilisibamewemiluxudu.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/70647314499.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/dbuhq6oqo47cg10e0mebl2meb7/70672541888.pdfIn PDF document text
    • http://newmob.it/userfiles/files/bubunifopov.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/dimiretewo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608f824f85459---venotinomewidofamepujox.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/dirazubekevor.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/94643914904.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/19007496897.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3ee3e7b2291f56363d26bc3d0f14d832/migabisigewevowa.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/39613850009.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/botuwodajitixu.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/loliwuxovibufipewuwom.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/69660064403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hacked+client+for+minecraft+pePDF 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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10696 bytes
SHA-256: 1055f36ede979bd51a7d1e97b1bec3b19230ae59069c2c3d04a9b56abcbe3e1e
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 16780 bytes
SHA-256: 2a6a25137e5d86c193d5b2fb8d54d0e8c834df6492c4f77709b062fc1e41e5fe
font_02_sfnt_off00012db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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