Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f0fb892863b801…

MALICIOUS

PDF

76.1 KB Created: 2021-08-15 04:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d400f61728955da3d28bfea844290a1 SHA-1: 07cbdb0dfa458cd931c4c45e7f1a6930fec6efc4 SHA-256: 46f0fb892863b8011554f1ed12e0c42f8e84de6ebc3e878d83a9720cc7d1b76e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, but the heuristics and URL analysis are sufficient to determine the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7t2l1guuaj57bdfllos6u2ppk2/vetarewosokekejiso.pdf In PDF document text
    • http://xibuhuanyu.com/filespath/files/20210806153335.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607095c4c911c---gaxusamil.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ee86275871f8ec7df96acf3f7a48458b/rofinexokotenefepum.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/43438822781.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/bakafiwerixo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160769e8b91e43---nepabowebilitage.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/sanajefusuxig.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611444459989f---46099904574.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kotadarosawebulakufume.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/gazofozedavinegizogox.pdfIn PDF document text
    • https://ka-base.no/images_content/file/zupezaxividitasigopokifu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/837394c958bcffafda8f4594e3a5a0ca/fumoni.pdfIn PDF document text
    • http://amandamaitland.com/images/file/61306190143.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/sogapozibivujatotogo.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/sekubidujesedaxovufazuvow.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/52340616154.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160f99c2c7cec6---40161902928.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/667aafc100dd2379ca196cd0b7b1437c/64994917308.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc7e9a4192f8da7f32db55d22bdd5c0f/30195848457.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/36799535035.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a8b4e6901406afc80c3df609b5477dab/5453642812.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/rufubilolosebupu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/388d9a77165604ab8a90fb78c3fbf524/11526875740.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b6b86783d2abd9faedefdd429fe7cc1/xinaxiworuguba.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/3153362901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=comparative+and+superlative+adjectives+videoPDF 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_off0000c5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D3 11000 bytes
SHA-256: a33cfe6ec44a1cbe894f530d5aa47baaefabc6df67e373fb18c77a906fdb5d27
font_01_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 16852 bytes
SHA-256: 91022f6c0da8ed9f5eb5df0ef75ec37cd5fe19434c349a72270600c0df5e331c
font_02_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1