Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc54c7a2b726770…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 06:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bceaec827a6066955ca333ae874a697 SHA-1: 769c07747065ba5d787995ac11837b5f488928b8 SHA-256: 1dc54c7a2b726770a4ffb964c89f7f324984ac67543a62499476984b13d7d7c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, a common tactic for hosting malicious content or phishing lures. Heuristics indicate a 'link farm' structure, suggesting the primary purpose is redirection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071d7b07bf---subagedamenuwasuji.pdf In PDF document text
    • http://wingmanresearch.com/userfiles/files/34410318491.pdfIn PDF document text
    • http://effektfilm.de/files/file/94179186504.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/80579621476.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334dc38f9d9---22468693784.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb33c5c3c3---safufigajewuxisikoxagifi.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/8356534075.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/5005105912.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/kemifikinolurebufe.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/bapukawofosejul.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/42968987071.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d88946a---dijajebitos.pdfIn PDF document text
    • https://superchills.com/userfiles/file/tujodod.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/subikemoj.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/92186643700.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/39814787190.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/25925834501.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/71948846609.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/42637156851.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/13424214416.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/73369735415.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kizadomuwukipelo.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/22579685020.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/12985028372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=avatarify+apk+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 17840 bytes
SHA-256: 6bcee72cdc2af3c54083156c2964ee088bae12c310d3ea67db1873180b616bfb
font_01_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 10396 bytes
SHA-256: 180c4cb6887035976ee571158b522f787225fa11ef478f51f5c15510c10ebdd3
font_02_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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