Malicious PDF — malware analysis report

Static analysis result for SHA-256 af37fc263d924d7d…

MALICIOUS

PDF

98.6 KB Created: 2021-09-15 02:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a02f5d9f9a13ddb16a8995a06e8d356a SHA-1: 732f4464795a60bcc6ada6529603e95d0b3d59dc SHA-256: af37fc263d924d7da1e6bf7d3092c209bb088b2c3df83480d38503a2e46b8b5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7164778c74d4df2d45036065c1e9d0f/rodabumad.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141259db942d---41356926440.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c7340c32---49788314788.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/756f67a3b44d8f64887565ceaf1f8729/12386123061.pdf
    • https://techielingo.com/fck_uploads/files/geviviwizanububepidotedid.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a48a40d7---54187452441.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fe347be4708a4dc7dabe908b979e785c/17018665368.pdf
    • http://newtarrytowndeli.com/uploads/files/15919045831.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f27d59c06---47718067836.pdf
    • https://aep-tc.com/cache/fck_files/file/46810159393.pdf
    • https://marblobathware.com/app/webroot/img/files/kupejuxudukomiloresota.pdf
    • https://vialivonica.eu/userfiles/files/zesagitonepo.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210914020508.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2tuac8bpagoht6v7r17900rmdv/kuzugegiluzipimav.pdf
    • https://censcakmu.org/board/file/files/mogupilodenuwiloz.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/noxapebem.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410fe3bd571---tiwuxu.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/vmsrmih7etoodl80vqs1vls4c0/88414799288.pdf
    • http://topenglish.sk/app/webroot/gallery/files/tekolof.pdf
    • http://ajtoablakcentrum.com/_user/file/manugin.pdf
    • http://yushendesign.com/images_fck/file/1630818454.pdf
    • https://ctners.com/ckfinder/userfiles/files/18141692261.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/jijapasoxa.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5a3a3ae---94371670357.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=first+ever+dragon+ball+episode
    • 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_off00011028.bin
8a3c504409bed2ad0bffe5461714d7ff7cce7fa851f9cb0d3f987fee2eedc99e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 10748 bytes
font_01_sfnt_off0001288f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1288F 16792 bytes
font_02_sfnt_off000140a1.bin
7ba15b53ceec7b40137168578f1c669789d3e300e6f83c4336749bab8fd742de
pdf-font-stream PDF embedded font (sfnt) at offset 0x140A1 22832 bytes