Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffff3e74d3bf5b80…

MALICIOUS

PDF

79.9 KB Created: 2021-07-03 11:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 656e8495f7037a450f4284022cf35cb7 SHA-1: 9717421e9877d3bcc6fe3d34537f0f9ccfc74eaa SHA-256: ffff3e74d3bf5b8081129024a7f53c4243e063cffa32423fa6fdab57ad24f0b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://g-shocktou.com/user_file/file/mukigevuloxusaxofobe.pdf
    • http://amandamaitland.com/images/file/74800247547.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a06c7eac2---64216763528.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8aqr5mg91d4ni1ualkpf8litq6/vovuzutukefepajexinoti.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c14a9ed92---lopegup.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ca8b1df17f20b6855117d34f9af506b5/66790336683.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160876aa6adbac---jivijawepon.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/104fd4b4bfcb6bbda0f424a68ecb6642/46698084361.pdf
    • http://guides2alpes.fr/uploads/file/fotix.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d24da376---walolijipanobiniralituj.pdf
    • http://bachova-terapia.sk/images/file/51257292154.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb707080dc---94723163322.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ql9g03c6fgj0tm5clos3krmn14/xepula.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6i88nb7ei442r1j7mtdvlt342c/33513489173.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160810a5f1a2dd---96777278841.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c112347d8457413778d7b3de59cc3978/debunakadapizale.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/398c38455b114edf7b36fd78bffa225d/77339793310.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ffpt6d8csvviu9akfd6876bph0/8115675265.pdf
    • http://qzgj.cn/upload/file/kidopovupujokumev.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cd35be9050ef502da1caa3dbff14d9bb/24426073761.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aca8f2271---fofilakotewo.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/womatumibixaxu.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/tidemq5nguahrhjllv304dbs4h/veresokuwajifodel.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ce392126233d178cf42035afde928d16/52841522156.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=if+all+the+raindrops+song+lyrics
    • 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_off0000d530.bin
4e0c353aa3dc2460a54869bbca06c2b9b4180d868838f433c74c841c5ce9c7eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 10964 bytes
font_01_sfnt_off0000ee59.bin
cfd90c3fe89a6bcde41bfb57f1514e72bd19a9f3ce1580188b880db1d6f5feaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 16812 bytes
font_02_sfnt_off00011a2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 16792 bytes