Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea8ffbd786ee657…

MALICIOUS

PDF

87.7 KB Created: 2021-07-14 07:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e98e6202ca947d18730071084c314955 SHA-1: e7172a65e9615e8061b70ab266e20fdd4843521f SHA-256: dea8ffbd786ee657300a8e944b7ac484b8f39900f8bdd8167b47750a86766f1b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://albino-pitti.com/pub_img/file/sowotam.pdf
    • http://dmhu.eu/uploads/uplib/file/29909501429.pdf
    • http://mobydick-band.de/fckdata/file/20942290428.pdf
    • https://rosycaffe.com/file/89940536822.pdf
    • https://gencerenerji.com/resimler/files/72531466233.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/14219448872.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/7lp5ht3nclcu0ibskor5jr4f0g/rupidubujawid.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed832008d7---sudog.pdf
    • http://citescolairedeledit.com/include/file/85948454707.pdf
    • http://rosabaum.de/web/editor/files/fuzexezoratafawured.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b741294d9f---lerejekedawagudesoxakolok.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f1d9sfk2ck7663k5p8mv9v35im/kevawipimenaj.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8cf5l4f2gm86l95d12behguovv/76069052566.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/12550788555.pdf
    • http://belhavenhighschoolalumni.com/clients/13962/File/pojitinupekekamik.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/h8c6j3qq40advou80ei3tij7s6/wavewasogor.pdf
    • https://jamuiboe.com/webroot/upload_media/gidudikufeg.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/up0cbltmd73cdajdjljka17b5q/rurufulivatulupezagopo.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708e758a0b6---natunidufelufopo.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad986184355---1908084130.pdf
    • http://elm3rad.com/file/numanebarewesebel.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/julugetepijijovafa.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/90555268434.pdf
    • http://ladyvenus.it/userfiles/files/72534422082.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=differentiate+incomplete+dominance+and+codominance
    • 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_off0000f138.bin
539a1ce091c3247523fc7cd95ad813291a8a4411e143d5c755212d1af21699f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 10616 bytes
font_01_sfnt_off0001096e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 16792 bytes
font_02_sfnt_off00012180.bin
294cfad052c9cb1583be48814e5ca68a000f72de00d3b5dcd0ea670301be9549
pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 17520 bytes