Malicious PDF — malware analysis report

Static analysis result for SHA-256 625e7762ea387cb9…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 22:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02ef925a171766b5115ecfaba67b9a5b SHA-1: 3e5cd2ace4a1cee0edb26e4c73b4944b7c4fa548 SHA-256: 625e7762ea387cb9a5f998017edc56bdc623a346cb4be0446fb3d89b563a5f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting an attempt to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=the+blind+side+full+movie
    • http://lahma.pl/_u/userfiles/file/zikevekafubote.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dcb24745d---zuruxizegemotawivakef.pdf
    • https://healthmatters.me/userfiles/file/befazuxoxugelukifovas.pdf
    • http://studiogiamberardino.it/userfiles/files/47427594753.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8635615e---rajexakakiwijusa.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/7554029207.pdf
    • http://wdnederland.nl/file/51806151471.pdf
    • http://unsersohn.com/images/file/vagufuwer.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c7f7636c93c4cce8ef0f86e1fccf669e/77045054917.pdf
    • http://terredellamagnagrecia.com/userfiles/files/xuwinutefexitavejoguz.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/96509447238.pdf
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/72766967800.pdf
    • https://beaszemin.com/files/zaxanubunoxatodufemanuf.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/jisuju.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f0119160242b4653d2f3dd922ee266b7/jarepuvajilazewap.pdf
    • https://mercerapparelss.com/userfiles/files/nowemowafobedodepo.pdf
    • http://7166867.ru/ckfinder/userfiles/files/34900357320.pdf
    • https://dollarplus98.com/images/upload/files/nulokefedugeware.pdf
    • http://mebizstekla.ru/userfiles/file/jilutewok.pdf
    • https://rubfila.in/files/file/zobodunadakuligosowifaker.pdf
    • http://yachtales.net/admin/userfiles/files/pejuxobolujewosomikaribe.pdf
    • https://aaaxxion.info/images/file/49578183725.pdf
    • http://szpk.hu/_user/file/63082260006.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/sotulunas.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0afe197b---nazupolipufo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b21b.bin
eb85ee2f62a169a9a41aad201cfc1b7ae292cc74f4eeffaaf9b607ec466a8e76
pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 10528 bytes
font_01_sfnt_off0000c9d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 16792 bytes
font_02_sfnt_off0000e1e8.bin
fa9c70f389aafc868a517c6976386883a94ea705e49119cff258f3ce5dd80cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 16612 bytes