Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7eb51f3c0cf646f…

MALICIOUS

PDF

94.7 KB Created: 2021-07-13 23:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47b5102f5c51897f3828d432d71239bb SHA-1: 952c0dc8d42d72d7ae6ee906998c00c820ad5d81 SHA-256: d7eb51f3c0cf646fcb2e19abf23b4e96c940ee97542616c9d2ca6e21c90b289d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for further exploitation. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ed54ebaa---6431999604.pdf
    • https://diedacorporation.net/freesiafiles/file/kekidaxozew.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b64d45cd---56753098449.pdf
    • https://thefertilizergranulators.com/d/files/34126988880.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0d95d206---31489972243.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8f4c5309---nopafesava.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443660da69---27990326367.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6s40tbca91o6hll3baqmof5jb4/ponebatimivo.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pif4s9gaqcjer7cv699krohar6/52680476638.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jrug1l1hipbjj5iat31nv4kort/lidomegolaje.pdf
    • http://jp-cable.com/d/files/xozupakitinuzop.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa37b1f2ae0---83978979435.pdf
    • http://lapenya.cat/imgjovesnaves/file/lelefuxuvaxoluni.pdf
    • https://cardion.dk/gfx/fckimages/file/wesatowi.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7afa61d5571acd0ea22fe47404c0e3ad/21503341923.pdf
    • https://tezerwatch.com/file/upload/files/06-12-09-14-01-94.pdf
    • http://computerdoki.hu/user/file/79565481773.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608713d7666b2---mipofasuwupenobabaxogi.pdf
    • http://chono.mn/uploads/userfiles/files/keguwiriwaxav.pdf
    • http://guides2alpes.fr/uploads/file/wepulidulexemitibevuf.pdf
    • http://rudolphalexander.com/uploads/files/71786262080.pdf
    • https://actorconseil.com/files/file/89505926130.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc25cfc8772---wanodibosamu.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/e44b5a2fb2c930c37e0c486ef59adac3/33499493560.pdf
    • http://dlmberatung.ch/userfiles/files/36903018957.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=reaction+intermediate+of+e1+reaction+is
    • 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_off00010a7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 16792 bytes
font_01_sfnt_off00012296.bin
ff63b41f26413c87a9d632dfd2471a3810822f65035b2ce64dfcd9cf2be37348
pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 10688 bytes
font_02_sfnt_off00013b26.bin
3f8d9ec38e8f1376c163900e2209690c6659842e1e5e752382a90fa3838bff22
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 18924 bytes