Malicious PDF — malware analysis report

Static analysis result for SHA-256 9712667d1f415c59…

MALICIOUS

PDF

82.0 KB Created: 2021-10-24 23:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 16b5a41f31dd8ac693f0edc6ffa22f52 SHA-1: 971fc63e5fd0d68e7802aecb84b085ecc81ce683 SHA-256: 9712667d1f415c59c4da471efcf11ff71a42c3f8d72830f6fbdb5afb8e92b5a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=stocking+stuffers+for+writers PDF link annotation
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97df682ec---63350788787.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/zadapobe.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://www.mostex.sk/files/articles/file/15466833378.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/49963071909.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/5635462036.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b481b88f2---mumafuwelobod.pdfIn PDF document text
    • https://noddy.nu/images/file/82075150775.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/78898981154.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202110211135143115.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/41357397267.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/10895707888.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/39581622528.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/garenexu.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/lebono.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1616724df84987---wapidodatexesi.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/43206604565.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/39400528072.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/34358460366.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021102400295282.pdfIn PDF document text
    • http://eventechsite.com/files/files/lakunotagalipem.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/fupuze.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/45263289307.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/80680996500.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/87847697659.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_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 18232 bytes
SHA-256: 191a77334429c8ccaa88cfb921648d43c24c926500800d4676a669c6e9d5ea1a
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 10656 bytes
SHA-256: 8e9e14dd0cee146b3482ab043e6d3727e85c529f8a52fbcdb6aa02e8287c80e9