Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2b42f804788bc1…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 09:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1465836ec8c2b0b393e3d5b357fd700f SHA-1: 5c8045e48b57790eed7ebbb81886232d9fb36987 SHA-256: ac2b42f804788bc1b2720c82e65c284ca56dfa5e43a433559c95577515370b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b942a037---suxofapododopetibes.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/682d846e0a996e392f50973e35c4acb2/geguwanizakupapeveridex.pdf
    • http://singlesync.com/userfiles/file/sugewefoxawasexofidis.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3q1or558i01lk5a4888etbq2qm/jebalinaviw.pdf
    • http://mousike.it/img_ins/files/fedurojatopujufuvimaro.pdf
    • https://argumentua.com/i/file/66307425475.pdf
    • http://huiking.cn/uploads/file/072236149441.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e9e2772130d31c2106824d42d512e129/suxekajawobado.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5dd47d1d4192ee7cd8ce81dbb598466/vevovebewepo.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eac2e98d4---70297364464.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hrv5qfkn163ejmfd3ohhor43lm/68519772185.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160affd2759b98---39798267288.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8daae5a7c---33242740484.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/23d03cdc09af36b426c4a1f4f319b59d/47764329203.pdf
    • http://beta-rc.com/upload/files/20077133328.pdf
    • http://crabandclaw.com/uploads/files/nosemisojo.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0fde88777a6ffdc201d338963e1fb576/1461245373.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b72dabcb---22201041096.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a9497f72---liged.pdf
    • http://shop-cartuning.pl/userfiles/file/medudalalelupidali.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/loguwudafamelibolasale.pdf
    • https://istocdukkan.com/userfiles/files/puverudisozuxoliguxixik.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2125dk20e7v8gnu3igospk2vrj/94372061813.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/dbc0986132a3ae0c4e04279fad8b8cb7/98950016164.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=trade+finance+in+india+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_off0000f8b6.bin
6cfb8fe46c1bd7c8375387b003fa50a364bc5dcbb087a020bccaa58efb0b7a12
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 17744 bytes
font_01_sfnt_off0001278a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 16792 bytes
font_02_sfnt_off00013fa1.bin
36c5724dc33ff581c4202300b1f8764319e1b2db28783a2be81ef1abb00d0988
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA1 10144 bytes