Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca24f684b602422…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 02:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fe05fe721dbabf752d778c995d4c178 SHA-1: 7caf62d12434dc3d5d9ae1d643e662a85989ee62 SHA-256: bca24f684b6024220832ff1e9e311752cf7359fe74a0ddf54771ec3852d5daa7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links strongly implies the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://playitdirect.ca/ckfinder/uploadfiles/files/58376967895.pdf
    • http://pileshoppen.dk/userfiles/file/futof.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/92f3a67ee8e1794274262e161434f196/45674226242.pdf
    • http://driscollandgibson.com/images/edit_images/file/62412603264.pdf
    • http://dorp.pl/userfiles/files/jopeziwep.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/35515561697.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c82b1004853d0ec6be25f008ca058e68/givewerulifalobujiji.pdf
    • https://avistravel.ro/userfiles/file/fotebufeposorasufapopona.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/730c0748e710fb32c43a2fcd2462e601/61933467589.pdf
    • http://japan-railpass.info/images/blog//file/79054004044.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f3eec2c66ed20095313019cb3bfe5856/zazuwijutisiwilideb.pdf
    • https://paron-rebondir.com/uploads/files/58414465200.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kq69d9m78ss1142mh3p2ioqd9n/96842551590.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07bfe521a---29579431616.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2a07b4m2bk7hr0bakcu7niscsu/37765462379.pdf
    • http://csc0512.com/userfiles/file/20210620113607_l7lglp.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4907204857---fibulozigowovizumadew.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ba65b808a338f19deac3e4ea252591c8/41309102744.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/h891aqiee1v0jp09113l46pca7/lavevexurizuso.pdf
    • http://msamerica.net/clients/873634/File/mijatukureseton.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/84478crebcijjrqfu8fa211cj4/dadasoluli.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805a3908617---45462406998.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ale+house+colonial
    • 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_off0000f35d.bin
698a6d006e2869796a965b6dd29d48e8901bb8dafccc9ef02386290fd3b6e627
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 17228 bytes
font_01_sfnt_off000120a3.bin
66f013fbfa08d305716018df51364fd780adf4a7942cbc1bab0356c16e9d377b
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 10208 bytes
font_02_sfnt_off0001377c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1377C 16792 bytes