Malicious PDF — malware analysis report

Static analysis result for SHA-256 4210860fc5f13cbc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 00:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d33928d35b1add0b87de712bc1cf6465 SHA-1: 9ae39353f008898e77e8fea2fcfc158617dd7b8a SHA-256: 4210860fc5f13cbcda7c5652384746da5994620bf7fe662ad9efec535121d27b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tongits+go+apk+latest+version PDF link annotation
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef164d0663---siginomotemomefaxo.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/runinajiluzelubixuzej.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/tebero.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/vadazolevofagujido.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/zitadobaxilawanuzegetovaz.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/22685127182.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/xibepugemogixopamuwo.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/karikefegipupurutokotu.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/wutagagu.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/lejinuku.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16149708a5164d---86237380523.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/80743197322.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fe65c7539---zenesa.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/lufefevisotiluv.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/65703312937.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/15232333881.pdfIn PDF document text
    • http://xn--bqrr0jw6bmw2g.com/userfiles/file/1632432219.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/ketozasesisira.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/38081272770.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/sudinegulikikapiponiwuja.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/91267936074.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/52710539155.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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 19164 bytes
SHA-256: 2f6dadef7d17258514f110c25e0e5dbeca6d1d17d32c1cb62fbcdce25ce6c328
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10548 bytes
SHA-256: 3493944212616ef6e287f3979502e10261ca9828c263c996db4847ba85dd06e3

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