Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac8e50d2676806f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 15:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73c27ff6b73fa7c8ae7d4a984cfaa986 SHA-1: 6a2c07c2f58aa3f996f85cd23d791c9d231b6a96 SHA-256: 9ac8e50d2676806f55f1b5501928f9a171ffd88dd03c6588925ec02fc1ba104a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ML classifiers and ClamAV as a malicious PDF, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_URI heuristic indicates external URI usage, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic confirms links to compromised WordPress upload storage, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/78989057631.pdf In PDF document text
    • http://chronicles.ae/userfiles/files/69311322226.pdfIn PDF document text
    • https://patc.fr/imagesfile/89913846428.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/77618860697.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/83bl7fopud10a6uff7ouubhsln/bitiwogekaguduwubidotulof.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/jojirugerape.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/memopikepetidutalikejevo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa7003310---tuwoxenaxuniwuxu.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/52877edff8c5f15341ffcf19f3297885/44221910128.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/79491208736.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/nigipadigututitebibig.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050714153668.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/hedvki2t8un0o39kg2a5vrn0a6/37571059603.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/27681219511.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5935657d66cd6d8542ce4f6ed7bb333f/20749672151.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080916c07a1c---51194494631.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfumsh10k5l34hmd5hmikefsfl/venelotejarowabelesit.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/pikobupetape.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/tozewevogijizikezo.pdfIn PDF document text
    • http://goref.ru/files/file/wuwipiliraru.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/98470825378.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607309b9852ca---50145052329.pdfIn PDF document text
    • http://riceart.ir/basefile/files/13361958433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=competitor+analysis+template+pdfPDF 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_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 17680 bytes
SHA-256: d8a440d1e74340ca56f13736f5ffd9ff78678d93a0eb3ccb6facc4eaa967413f
font_01_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 10804 bytes
SHA-256: 13ef5befa9d238248786db8751b05e6b67f199b434c9ad9bea92bbe1215681fe

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