Malicious PDF — malware analysis report

Static analysis result for SHA-256 597b0d0e4ad1b05f…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 20:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb174e9afe175a00304a81087515a366 SHA-1: 62fab5557a5723ce6c042da5194a74871f353acd SHA-256: 597b0d0e4ad1b05fe77cbf2c514d2adada1de2999f3f1f08a2ec996a75de6b23
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a665ab40a---rasalebexogezusor.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sao4ga6rkl5ku93pd9dqgr3pv1/bigurikisadokotir.pdf
    • http://annandale1963.com/clients/69704/File/zufipokojukikubog.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/b37d4f16659ca33c909e91678ebc29e2/ratugu.pdf
    • http://gtlmarinefuel.com/userfiles/file/27244711107.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ai0lehl3i1v9acveoe8qm0evkr/xugutibofukezazivikote.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/83f9f87befd38bca04cb7e213e09d67c/4200909577.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/47hgb9cqm3i14965rs7uo4hm6l/rujoxufolabekuroz.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c7d3aabd0f20a2712198700c3568a136/memakunubojaneruwobokojaj.pdf
    • http://dush-kz.ru/uploads/fck/file/xikobebenox.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4eeebc22---31648172546.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bfede29be60---difolej.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091d98d4f0b2---8294811019.pdf
    • http://chizclean.ru/files/fck/file/lovokuleretikok.pdf
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/ziketajukosojosapesod.pdf
    • https://asiarsolutions.com/userfiles/file/mozuzarakafuxezoboxakopa.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c235bdc0ff3---54099104483.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160989f6eb4729---jotojejegurapuxata.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=global+liveable+cities+index
    • 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_off0000eb95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 16792 bytes
font_01_sfnt_off000103ac.bin
11512ff53c2bbafffd82add06b0485d22422158071b3fa1d3bead984d63720d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 10612 bytes
font_02_sfnt_off00011c1e.bin
22ba2bdd5cb2915c9fb120e5924ab2246967b5dfd77e5adf7f518a0d03998ec6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 16928 bytes