Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6644db61b7ed4d…

MALICIOUS

PDF

75.2 KB Created: 2021-07-30 18:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8073ee13062a2d8b1267c02a01a0996a SHA-1: f3e68d582d02bcc45bbe658718f201c958aa7c40 SHA-256: 7a6644db61b7ed4df6b0cc38f8c2e1e2e5d70e227650d3cc4e699816caff4fef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/uplcv?utm_term=mainstays+cube+nightstand+assembly+instructions
    • https://morganmethod.com/ci/userfiles/files/xovogudomosemepe.pdf
    • http://caratow.eu/userfiles/file/46375130167.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1a92e1793---27250929845.pdf
    • http://vieclamquantri.net/upload/files/1109372756.pdf
    • http://lltsg.com/uploadfile/file///2021071222310152.pdf
    • http://agataklimowska.pl/userfiles/file/14378976256.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82e93a9b0---13442855993.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/39920970552.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/19072365174.pdf
    • http://nextgenship.net/upload/file/20210523162174795476.pdf
    • https://ctners.com/ckfinder/userfiles/files/51456872011.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3678126b91---75747181349.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797cc8a5286---59830151633.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5ed9c9297f64866cb602b84b538021b6/gitenavuxevazunuxisukipot.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e6901781bb25430baf4382f1cf657799/tanelobonax.pdf
    • http://mya1fc.com/files/ckuploads/files/wawiki.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/864ghuuilv9tf5o9efg8b49h8u/36261277057.pdf
    • https://pui-vital.ro/msg_media/file/67213756259.pdf
    • http://massimosusto.eu/userfiles/files/13151108457.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd64329598---feker.pdf
    • http://drapa-technika.cz/UserFiles/File/zazizozojibidepa.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f475bec4c---37793143885.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_off0000c1d6.bin
d505bcc74d267caec575ca5f3f33069b082fdc55da95db239b2a85de089681c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D6 11164 bytes
font_01_sfnt_off0000db91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 16792 bytes
font_02_sfnt_off0000f3a3.bin
492761d9cddc7f885f1da51303890577fdf0db11c2c3bb64f2def5a32a2419f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 16492 bytes