Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b48a558e7283a4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 15:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c49af56670765f0b3bb45dc066439e10 SHA-1: 1f10be423f43b5e229f7b26f44589c4446acade6 SHA-256: a3b48a558e7283a4804983cde110abfd5cce641ed5b9affa12b5bdaff6708351
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=what+color+can+i+mix+with+pink+to+make+purple PDF link annotation
    • http://alpinist.store/sribati/editor/uploadfiles/jetokakirosemofabunesib.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/mupalifitimiguwajanusu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6843717c---bitagafed.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/raliperiwasazepowikuw.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210907035536986840.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/69614915621.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/58932236473.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/50608908887.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/difasifexewatuxexivukaf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9b5d7fc8---xebopudewonajamazaso.pdfIn PDF document text
    • http://potya.com/76585351247.pdfIn PDF document text
    • https://eklyps.net/images/file/63093700010.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/386c7a8eeb9f2bf9fe78b5ee57b0863e/sofutetefibafisuwege.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109070422427178.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/suritezefede.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/62369350230.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/fiwavuwivurir.pdfIn PDF document text
    • https://12tiga.com/contents/files/mutekerumodekigamugote.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/nevorazukulajijezefenanuz.pdfIn PDF document text
    • http://zxsolar.com/d/files/57803097855.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/94075009398.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/1276636820.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/50255527494.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/rakixuxisijesoner.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/67861428404.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_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 10844 bytes
SHA-256: a04e012032b7a6f5bdc123a2d0e37eabe6af01c9b0b7fa4db8fa4c12a21536f4
font_01_sfnt_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 16872 bytes
SHA-256: 07c351f314c2512347f9683fb999f0e97a83122a6b6b04fede173f9b2f06ba10
font_02_sfnt_off00011e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.