Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5fdd6f29519943…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 03:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 37b8e6acc3a7a475b496ab99f5cb7689 SHA-1: febcefeab7aebb15c8dceb025779824e66c28fd5 SHA-256: 7e5fdd6f295199431d3cf81c7bc49584af6a5c8bf2435c165c105c2663f2cb76
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://nhhs78.org/clients/63854/File/59918971820.pdf In PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/63803c7f78155fb5bb6e2a8df91700a0/17506403769.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090692fdce19---9890731854.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/27685364084.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c5fac00fe---dodogagino.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/kavavisezusiroloxopera.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/alv562ql498ql0vspjidbl01ga/puxefesazafemitukisikura.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc48d33a03---dixupenotojumel.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608736a75569c---batinej.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/gomibijivuzavukikovedetaw.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///surebuzedawelug.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/34583904108.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/zerodupumuradogovamelu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/lusipivem.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/melizewefuxugenuzugixi.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/52281795758.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e4f8c1379---38372102375.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e7bd64cd---20058273497.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c496b83f---21247064818.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/517c32db2abec0ce287d404a987b82ef/84792386380.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/150050595.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/313547727471320c53cd85d0ed083e34/21604681698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=at+our+wits+endPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 17264 bytes
SHA-256: 3d7fec0a808dd481db01b6e719c5073a466f9e91ee16e86618a34dd316c33d5f
font_01_sfnt_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 10200 bytes
SHA-256: f1e78dc73fc8242a34fb60afd2b21a3131b145882ceb1f9e3b1520ad11d950d3

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