Malicious PDF — malware analysis report

Static analysis result for SHA-256 7632a07a33ca8bba…

MALICIOUS

PDF

80.9 KB Created: 2021-07-19 15:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e518e3cb2556e8404b071842be663445 SHA-1: 36736c365a6e955edc239811ee62c2c371461d26 SHA-256: 7632a07a33ca8bbacda696f085f205f1f3897c8fb6cf522971b7ec0b3ae93b76
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://elnativocoffee.com/silver/upload/files/kosugija.pdf In PDF document text
    • https://upbfassadenbau.com/upload/file/wikoragenozob.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/361bc2a9f7dc58590fa58fccd7829499/55393659291.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cbc983e8a97cbbca6926ca40b1c156f4/2910575276.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/xugux.pdfIn PDF document text
    • http://soupworld.de/upload/file/rexalerufepi.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/makuvifelujosatamobabadep.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/nuberojofebabobegiju.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210627030752_78dee.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e443fdd9---lelosixiwesujigomobes.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5e3d98a21db4bb01d93d8dae40247cbf/xavakamixi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501033756920486.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e29f2eb662---22720369175.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/68954116873.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69eb16cfe---41881361477.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16e558bf0---pazelikeluwarut.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/selebezowexag.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c7c72f29---49985957457.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/tejurafixe.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/dopaxize.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/98899408598.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dacbd2cd0---94125351421.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/zanimevijitopamitup.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95588873554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=thomas+the+tank+engine+colour+inPDF 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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 16720 bytes
SHA-256: b6b187d4e02c72a93a88b3d4ad1a57dac06a73815ccd68af26ccff7ff9406524
font_01_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 10832 bytes
SHA-256: 5bffab9ee8dc2578a7fcf433f56fea7f4fa4216fbb9981a93afac895d761f7e2