Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf820005926942c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 08:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ea9a5184a1f5979a0c0ae9df2e188f9 SHA-1: 80c0b3b9848881421796c011954348158e514482 SHA-256: 1bf820005926942c3d2d093c36a06ed28d31afca86c3849caf3b3f888ae3dc92
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://irlanc.ru/uplcv?utm_term=engineering+graphics+book+free+download+pdf PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/03258c88ac69ccd5eb7d5a378a1fbc19/42113623475.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/58891409961.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/niwedokudepodumusas.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2024345c---nudivusuxipitimo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e1347fad0fa3324a57f9c8a21f3e208c/zatogeru.pdfIn PDF document text
    • http://lulanjina.net/upload/files/pixoxa.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/98450180435.pdfIn PDF document text
    • http://haki.vn/uploads/files/jesarokimuzomori.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a09589ec2---bufivosetilisemirok.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/sugevosusosotaroririlepim.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/bojoseji.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210621182347_4uiaju.pdfIn PDF document text
    • https://defi128.com/userfiles/files/92266830286.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/gisepade.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/pasurivimasitib.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///jubogekituwubofilu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bb89e929dfd4f50bf42fced1f2c46b61/gomusurelepuxenipurizaluj.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/18/file/20210518_153540_176.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zejavexovotu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/124ok9g8o7ta32urmp5birpug9/zapukibiworegevoxoz.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac81cd41cd---dupemawotabamesafamunituf.pdfIn PDF document text
    • 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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 11104 bytes
SHA-256: c3512d5ce22a555652c8e164cbbb00706b071d7a0ff087224d29d371bb055a7a
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 19336 bytes
SHA-256: 1e6fc3a1c3ee1d745e016b1e35ed864a48ed1be93a366bf3de3747f604377512

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