Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0587479f1930e38…

MALICIOUS

PDF

80.8 KB Created: 2021-10-05 03:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5c7c1e94a000535e5d057abc76126db SHA-1: 876d230adf7593e771aab2af3e7c5cfa203528b9 SHA-256: e0587479f1930e385ef08f0fe132d405aa3e3cfaf70818e3a726cb93be67da8d
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The PDF's structure and embedded links suggest it is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://findmealocalpainter.com/insurazon/admin/userfiles/file/21629703168.pdf In PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/laxubenatukigifefen.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b321e1467---xewebal.pdfIn PDF document text
    • https://plasterglasgow.com/fwd_docs/file/gexulevegewowutaripevor.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/xeladopegapojubux.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/sedebemudizi.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/vizorodopuro.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3538096757.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/34800852122.pdfIn PDF document text
    • http://kaies.cn/upfiles/210907005745356268eur2i6.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/51984113178.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/73632187703.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141902e0e369---49599888350.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16159cbcac8bee---45861507849.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/995879928.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/4791167925.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/90256919064.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146adbe4ccf7---dekodezagu.pdfIn PDF document text
    • https://thehealerspoint.in/admin/userfiles/file/5217803682.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/56142832784.pdfIn PDF document text
    • http://kustari.net/userfiles/file/kedasefu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/26acd84f4422bda77b9c549f93cd9769/povepaxib.pdfIn PDF document text
    • http://hasyo.net/files/file/viguwuxidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=physics+chapter+5+class+11+notesPDF 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_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 10772 bytes
SHA-256: 44028c958608c1d9dc6cfd2cdd284cecb4e1a0f45a5e2ee23e617edd5cb42c8d
font_01_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 18604 bytes
SHA-256: a7b2575224ab30263839c6e85057ba2f578bc20927ddaf45b9c01d0b02c74549