Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6abf7949795ca7…

MALICIOUS

PDF

93.0 KB Created: 2021-07-01 23:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5e6eb5cb235778d34c9e3b9dcfdaf0b SHA-1: 83bbe1e90bad373bb6d545708a8e52f85b59b9da SHA-256: 4f6abf7949795ca7c7e983273bd9ae06aba696af7e59061d767a2e3595f5eee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2725675e0---sojukipokoxokamuxaza.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/51368366118.pdfIn PDF document text
    • http://belst.by/upload/file/lugixarozabirafopiwafugas.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/946062633731625067290.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2eabf926d7---99985003812.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8e8bbaea---22605650668.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/bedijogis.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/7ea672d9cbc2f13125a5747e1e7886c8/1893090711.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55351145809.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160943f53cd43a---28725738033.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/78456166131.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/aef9fa98f52205e63be28970e8b774aa/27699504161.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261520a518---70062074389.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/b431e0f7d7a0373596ded16392fb7885/21816230074.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kisusatonemubibajigaf.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061117250270554.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f6872dc7afe064722125ec73728669f4/govevirufolebotu.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/43931761024.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8017dc3f7e---gomomupunatexaxogujogose.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c0d45b0a4---latutowofibavejet.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0bd2954238e96bf4dfe5243cdb5ed291/pimazadikipisi.pdfIn PDF document text
    • https://mfdesign.hu/files/file/giriluripebeboxerixapi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba137f0d5e8---vetagadixamarizuzuziteraf.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/86351949624.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210622/file/16243554833142.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/42046e4c0e9c49a0d015d1d2f2aa37ec/85525805623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=access+to+this+website+is+blockedPDF link annotation
    • 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_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 17312 bytes
SHA-256: fe34cb15373162065dc06edfeb36bc503c93a7880f51894f62af4c6648bc176f
font_01_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE5 10400 bytes
SHA-256: b99178a9dd39771275901aaa1fc521c9a780d61a72786d764b21bb6254da484a