Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aee9003788c7e08…

MALICIOUS

PDF

87.3 KB Created: 2021-09-13 20:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3a6ac80afa756688f4c1588e9ddf236 SHA-1: ca377612b2e94d3ccc985f649676f3dc4bc8960c SHA-256: 3aee9003788c7e08096a90b62cfff1ed83dbf7b874668a5c473422d9fd9bf317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous disposable domains and compromised upload storage, suggesting an attempt to direct users to malicious content or phishing sites. The presence of external URIs and link farms indicates a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://nemdanangpho.com/uploads/2021-09-11/images/files/99039898634.pdf In PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/24863426185.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/98183003999.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/76898242601.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/xafuwodasujowenelifadi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008201cfd7---81878244130.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/topeza.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6fb7b0c7ad0a3ce2d9ca3c95d59622b6/64387660067.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/52054718597.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75330827011.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/pifefobivowedegajimened.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de02231d26---fatukugedatevunejugegapa.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/tesufuni.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/62263404025.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/sononinimupemowivebusekev.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/38493124940.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/riderowowelitin.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/rejorenen.pdfIn PDF document text
    • http://neteyes.eu/editor_up/lavizupo.pdfIn PDF document text
    • http://llux.vn/uploads/files/84377887872.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/2151641052.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/jexaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=clipclaps+app+clonerPDF 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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10300 bytes
SHA-256: 8416669b034b55d2f331fd846afdcf6d49daaf2c392a98d71a0b8d6a34a83fd0
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 18432 bytes
SHA-256: 93106712181c4adf47fd29db94422f0628a9dc2d62222c293921a8a28047f652