Malicious PDF — malware analysis report

Static analysis result for SHA-256 158afdb6f93ebbec…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 14:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8309b15e3365b000ccd01d5b260046d SHA-1: 86d8222beb454b143b0b6b17dff2e03ada46e7f4 SHA-256: 158afdb6f93ebbecfea796e05a2aea76387629175621208ea4fea980b4ec2ed7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, forming a link farm. These links likely serve as lures to download further malicious content, such as additional PDFs or executables, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://botorka.ro/userfiles/file/xirikivetomojisivalorin.pdf In PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1837594c1---xanujim.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdf3a92e4---60895323796.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0b481d45---85953121915.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/99728573142.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/35702668206.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/82825581289.pdfIn PDF document text
    • https://red-adlay.com/upload/files/lisigabibibazogekotabulo.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/74486052340.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/95093402567.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/8e9f25e725ebe788ed81399e0cc6b3a7/60568376617.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/difikowupuzexunepovife.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f059412c129---39876454618.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720340d3069---senafunedabusazipiwukepe.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/51237970890.pdfIn PDF document text
    • http://kaies.cn/upfiles/210721201448025621igbu3f.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/ledesomen.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/noditumidatezaxufi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee013d15842---fanuguweduvu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210903101950_56khba.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f64f4ac08db263225d6c15e6520a2729/vujalu.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/tuterix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=human+development+and+economic+growth+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/fupumevunejasorawidojum.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_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 11140 bytes
SHA-256: 603a911fc284a7e14f083ea7e337e6485aa69bbe36ab7acb3687964f370e6c71
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 17592 bytes
SHA-256: 7dc900150eae3f0b8a5b4f0bd23f597923407410d2f1a00ca78af1b28fe8c966
font_02_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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