Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fef419747f9d418…

MALICIOUS

PDF

93.8 KB Created: 2021-08-07 16:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d16c13476cbb28b568fec1de0422428 SHA-1: 2d5f586e6cd5d100a949ee99fdd05a2eed5d823d SHA-256: 1fef419747f9d4186eb60c835911ef8c687791a69129ef7bb5526af2cfeb9e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with malware delivery or phishing campaigns, likely attempting to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://laborke.ru/uplcv?utm_term=do+you+have+to+do+keto+while+intermittent+fasting PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f1f4629e---puzulezijanes.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64cbc3d16---pukit.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/96287942999.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2vdvd6bqr1jtubjjpgas5svbsl/kuzebamipuwugutodum.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210724140209.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/nuxoxap.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pumonidatez.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c27527b2ce---79634293643.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-23/20210523201232607042.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/soroxilot.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/42574348981.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/luvogina.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9338cb85---6172069511.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/xizisepavewezijuvid.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/58e06607f1f1066252822fce0c4a54d4/44804707201.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/54918316207.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/41128654711.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/venuwubitabuxopotixewuw.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f82896d2d18---jolelaxakefovelobosugazok.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/sojijugamazo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e20c05be4---82060750697.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/81302004872.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1m0hgva3q8c6r1as48r1qj9tn1/kotumuzetirezuluzeza.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/jesatugosikesivoligilakor.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080285fc8faa---kizewoxatojulovo.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/25582817306.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/84909079604.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_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 16528 bytes
SHA-256: 6d6c8f6148c3655d1c6d5f55eb8ee46b1e7bfe21e5260f0af2545513b14bb644
font_01_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 11260 bytes
SHA-256: b74335dfd6ef9382ca946897fee764635963f43f1a89213686615373d1e14d1e

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