Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bda706401f41c2…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 19:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50230c48f08750592c376b42ac8dde90 SHA-1: 5ac2b9b8c4b95e56cd004625482a5b5e6576b793 SHA-256: 82bda706401f41c242d986eaf868f05ad63bc1d07547453da720c68658fdd127
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2bff1163b---14694467496.pdf In PDF document text
    • http://bigandtallking.com/userfiles/file/zemiledubarimosixo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4c3a6883---xonakibakonodik.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/1615473043e458e803059c1747171c7a/94249501499.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2uq81eecri3p5q6rrv2ugr5hn2/93871975376.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a76d5c04d34---66440311199.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/e1d1f1cdcf2dd7dff86fb249c797be42/vakipibinavibafufevenuvor.pdfIn PDF document text
    • http://tms-operation.com/upload/files/pelavupupifukariz.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/20389911476.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c95a209e---bumusabepexoxi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pv6ejk7p244bsdb3812bvmv292/2278628020.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/43d2c1cdbc7efe5c155714d2ef7d4a1a/bibuwi.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/goruz.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/44246342504.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/fowisukavugamululepuwef.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf4b6e17c---31063159815.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c91f5f56c85---59200979762.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/17753560660.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757069b0ddb---xebelurevuw.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7567cc592---22001819837.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/a3ebd57b4beea8c3e026d6c7855760a4/jiwokinerovi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b88cab3f78---jawilitinozutaki.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/xalepubatagokamutox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=uos+online+challan+form+for+degree+verificationPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cb2b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCB2B 24140 bytes
SHA-256: f770bbf78d82449ea32a32863cf446d58db58fb7b3021e1b693606e66e0a1921
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 10996 bytes
SHA-256: 4fb98569ab0d05176c150edc3ebc011823811743bbe20154b27f3e914466ad82
font_03_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 16440 bytes
SHA-256: e11d70d1fa81b57c73aa69012652972b137aea999280e4d5d3e70fdcdfb01c96

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