Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a29d154ddba368c…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 12:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67107d108f0940c8962a26a4d68d09ac SHA-1: 092d361e4d772dcb9b4b689915f71b743a5dc77e SHA-256: 0a29d154ddba368cea8650f543a09a595136c6f52b42c15b8963601396ea0989
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command-like sequences within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=quotes+that+show+curley%27s+wife+is+lonely
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d88048204---14907254752.pdf
    • http://autosklo.sk/pictures/file/64649824931.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/di6gpcdfhmdadcccbpj33q2o3m/20904339995.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609438ea1778d---39367289307.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a7b84c87ce7e7a033951aa04e6c3129b/mazufarupozodatam.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02e979fc9---71546500262.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093fde201853---jopun.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2a8be11a---losapalasukefikosi.pdf
    • https://goodline.by/userfiles/file/13511221009.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b04de43c4---38535367967.pdf
    • http://hongshengfish.com/uploadfiles/2021052908362382708.pdf
    • https://mariellatriolo.it/public/file/nugiwikezojoxibumozese.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/tetuzemekaxoneroloz.pdf
    • http://analogsys.com/uploaded/file/1481575731608e1c18a394f.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4a4a84b3d7bbb7dc84d6dc7508f3b76c/vajanilejebiseduliraw.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc14e906d---xitapofobamasugeketewak.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3739b0a385a1d24d46604ee11ee2630b/nogit.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a50cf639---nofewutebabasuruperebi.pdf
    • http://copy2d.com/ftp/image/file/nanolubunumuwepo.pdf
    • http://tahi.hu/ckfinder/userfiles/files/zojenimoturawakabulef.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28fcbb533---69576576003.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160985abba38ba---49587858977.pdf
    • http://vdgairconditioning.nl/wp-co
    • 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_off0000ec76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 16792 bytes
font_01_sfnt_off00010488.bin
eb88ac402adbabe1c66001eb8305b73c015e630d938b1f30bf0915651d69a085
pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 16996 bytes
font_02_sfnt_off000130b6.bin
7e4acd27fd4038fd2e9f13c7b94bf46f30e79e488c916a7d425cdb624f3ad6dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 10824 bytes