Malicious PDF — malware analysis report

Static analysis result for SHA-256 e328e7e470a64755…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 00:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f9b7f915f11cd2c75be86649ee90e98 SHA-1: ad72f7742d0ef5d0f0ca8bd1a52b93a2157be0c9 SHA-256: e328e7e470a64755a2779cfe7f180857296cda3b7cdb75f54b88198db83f88d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nuklearmedizin-amro.de/userfiles/file/98357118155.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff58eaf73---bebalolesuvijo.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ce08f0b3---mofijazarelozobudulur.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210907_47C69B541EEC831F.pdf
    • http://www.bluewhaleline.com/image/upload/File/kapuliwixuziw.pdf
    • https://virtualpulse.eu/UserFiles/file/84782690619.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/25867330412.pdf
    • https://ntiverification.com/userfiles/file/42097469040.pdf
    • https://itchanoi.vn/uploads/news_file/8571554934.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/bojagibowaf.pdf
    • http://superfasttv.com/uploads/files/33704712927.pdf
    • http://hoya-system.com/uploads/files/202109070302246755.pdf
    • http://ux-school.ru/files/files/butexupubazatupudamedoxim.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/2721990866.pdf
    • https://espiber.cl/images/uploadedimages/file/4185363652.pdf
    • http://orderleesushi.com/uploads/files/makogeditorisobuvu.pdf
    • https://vespaclubcagliari.com/userfiles/file/kaledeb.pdf
    • http://alimentosldm.com/userfiles/file/zadipemezevunageziwusu.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e79d8a5bfa47190ac49354d22496856a/15867249847.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/jesopokisuvixudarubaj.pdf
    • http://lsneotek.com/ckupload/files/81171054777.pdf
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/nukozixoj.pdf
    • http://motolargo.pl/userfiles/file/15316967829.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+pdf+app+for+android+free
    • 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_off0000e284.bin
74a69198d343b04aa900510d4cb76ad135eb036eda374ff47d6be8b28805af89
pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 17672 bytes
font_01_sfnt_off00011072.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 16792 bytes
font_02_sfnt_off00012889.bin
0cfbce3b9ae94b08b6e0c14d903a59a49a1e53c1c0ffe53a177b299ef1126227
pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 10500 bytes