Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44eb768772c2317…

MALICIOUS

PDF

86.6 KB Created: 2021-07-14 03:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 101e1b0afdac8e76d82068ec7863009b SHA-1: e6bc1041675e94d6190b5ceac90f5d196cdbbe04 SHA-256: f44eb768772c2317461bcafe8e3759844881a201c159475392f0b1ec6cd5f4d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting. These URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://crewmak.ru/uplcv?utm_term=live+football+online
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r3u68kpa80bb1nsbcftbuvj79k/vozomepewozelirifibosozix.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5061e9a6afaf12bbebcd77354ee32e79/zulafitopenojegetujamipe.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160925daf5394d---bodobak.pdf
    • https://sabagdasarov.ru/upload/file/70350892686.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65904c976---mepuvovinizenimidum.pdf
    • http://hilimall.ae/uploads/files/xazibofanosawapakexiwori.pdf
    • http://kokocurry.gm/userfiles/file/rebovukideta.pdf
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/36070208867.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28d3c27a1b---jijaramiribetowokotemura.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8de6e015e44411ae4593458369bbfd80/41527034683.pdf
    • https://beyondpins.com/calisma2/files/uploads/79606722308.pdf
    • https://fnb-concepts.com/images/uploads/files/11131168636.pdf
    • https://tipresentoio.it/images/file/pexuloforunip.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ee045376d45---19503052037.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/12356866529.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160823a2971dcd---noziforazol.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/visolalirupaw.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2d7836199---regosovubupi.pdf
    • http://uralinteh.com/uploads/files/33900303262.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fae10c6a---lawolamabujarasadilal.pdf
    • http://novichiha.ru/pic/file/73170645241.pdf
    • http://project-lovcen.me/userfiles/file/76663288606.pdf
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/kanasofuxesudamu.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/prkrqqhkoijml01bl67ishbrib/16128234763.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/imusi97h8p5mim1604cmvp9rp4/vukuzidusazomobixixizuw.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fcd1c9cb1b84d723bb7b009d6f317269/pakubazebabajikugelusixi.pdf
    • http://obasekiestates.com/UserFiles/file/kurifumojivelagelupasaf.pdf
    • 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_off0000eecb.bin
124cadd8265a06b3ac2c80b2c213c8fd012853f2533682e8d4dce42a19073b16
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 17548 bytes
font_01_sfnt_off00011ca2.bin
42124b87941fb5a6e6f93ba3aa22ecd7a04a59f0e3ffe7629aa2c0ca7ebe1cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 10100 bytes
font_02_sfnt_off0001334a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 16792 bytes