Malicious PDF — malware analysis report

Static analysis result for SHA-256 7439b03c627c3ed1…

MALICIOUS

PDF

109.5 KB Created: 2021-08-02 10:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 598ae4e3d128fb2aaca61c1682fb364a SHA-1: 1e3bf449f1300a3dfcf3fb469704179bbaafe4d0 SHA-256: 7439b03c627c3ed1bb0e725c1cfaf9b5c78364f206ac0ee7c6e2823338fe48f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress upload storage. The PDF contains numerous external URIs, including one with a 'utm_term' parameter suggesting a phishing or SEO-based lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://irlanc.ru/uplcv?utm_term=how+to+fix+e4+dishwasher+error PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc3931dc9---zuliloditudaro.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/18998904829.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/60791852524.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7714e81d80f38fefae7a6a48e3f819c1/zutewinusowapisorafu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719d5c872c6---8707232263.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bde0e487b---kokozunowarug.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/riwamuzubo.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/gikajosatunotajiwawiw.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bb4c906f89ee47f470a6fbd7dfdee12d/87891176921.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/34459603523.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607720fac764c---garujizunixawadaw.pdfIn PDF document text
    • http://exima.kr/userData/board/file/86985468093.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/jerarugevos.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/18391595083.pdfIn PDF document text
    • https://rm-parketi.si/uploads/majevulirokekoto.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9595cef7---50751135940.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/17269749527.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b825c4a2fa3012e07dd016921239866e/zojozijog.pdfIn PDF document text
    • https://grnca.org/img/files/files/73175321939.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/a0ce937d2ab9385d29b4b5097c143e27/6367836722.pdfIn PDF document text
    • https://masihpt1.com/contents//files/jipewunasitalozidujivuzu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sibagukimobatebufosadiw.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d527e9a1c5107e0f1c38f6af582b177d/46817498102.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EC 17560 bytes
SHA-256: 43a5af6779a117e6715032efb4d362252b6a9ebe0df36a925453d07ba1a4f423
font_01_sfnt_off000161d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D7 10560 bytes
SHA-256: c627b3bfa85a363b1bf1950781307fffabc0a63bf1d0eab495f4205a1bda37df
font_02_sfnt_off00017a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001923b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1923B 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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