Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f01443412abfe5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 17:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6100373a5f0604e918e5dd9e2a3edec8 SHA-1: 323988142f0d338a94df75b41147aa0e2bb572ec SHA-256: 69f01443412abfe5468faf288fd8436622d17a060f3bdbf5b6442e5dd32a2d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external URLs hosted on various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=obey+the+game+unblocked PDF link annotation
    • http://duancanhotot.com/upload/files/38702122579.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/52872290435.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/bidojiremodoxesalufab.pdfIn PDF document text
    • https://wasael.com/userfiles/file/tadafopa.pdfIn PDF document text
    • http://iviltra.lt/images/files/rigefalulavotadadasanir.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/efr699qkqa09rbgg02e2i62ufj/78678500931.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/kisenivumezozikeganefuta.pdfIn PDF document text
    • http://ihdbd.org/upload/files/sowuwipudazupoj.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/59925577055.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/laxanazet.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ac2564bc2f4f2c50017d239d86efb83f/wulowetekedepodu.pdfIn PDF document text
    • https://patc.fr/imagesfile/49323379669.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/46065083314.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/77656281456.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/75715624538.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902071404359629.pdfIn PDF document text
    • https://htchninc.com/d/files/pozulolewezudamimevazaleb.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/baxuzutozikomulovu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e456b6cb11---90937451223.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mogowukoturep.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/girubutevetudaxebirofak.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/zugovo.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kagewujuragudetizomamos.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210911045322.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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 10928 bytes
SHA-256: 1605773200bd6895efdc88e1f752721ddfc1b55f2e8ec76da9608e16972ecf19
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 18204 bytes
SHA-256: 74d01b09f6530c497eb3ec0b4a608dc0af1d3767aed638e840123a3668f44e8b
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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