Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d9a9cc7ba4dfea…

MALICIOUS

PDF

92.3 KB Created: 2021-06-27 06:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 453e534c784aec40549812189bfc528c SHA-1: 4a95a61bbe8c39c74145b574270bcbc7eec7e621 SHA-256: 33d9a9cc7ba4dfea36404803e4288eb5f1d0b6fb159a90136ae1c45c5ed0ea9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links and the use of compromised CMS upload storage suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://crysiq.ru/uplcv?utm_term=which+then+to+use
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076793b2ebaf---ganetimadizinatu.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sugce1psek81aee1mrra13q57j/27315393390.pdf
    • https://luminex.pl/upload/file/wunikit.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b05fb64a8---wuzosopowedewewozolemuj.pdf
    • http://topas.lt/userfiles/file/tezutewajaxap.pdf
    • https://asiabiru.com/contents//files/fipomidulano.pdf
    • http://suachuaspa.com/upload/images-content/files/48367854988.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e1b09a33---dowolaboruwezozaje.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa5a85ca1---zuvinuraku.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/rememedilobe.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/78d891c784a2467ba3b1dd7961cf527e/mubivojisurebak.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722e625a3da---80138492734.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca801b1f59---83883822728.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/39777d5cb12f690d9389b2e13810cd6a/73402177462.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/frambtkhf7msd2cc2ehsbrc872/67453912674.pdf
    • http://tele-video.ru/upload/files/pawawivorujurob.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a102059f0c4b8111f1d95f54616e8d34/pejamuvakexivaxejo.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160771de820bfe---diwifupodowen.pdf
    • http://chandigarhdatarecovery.com/files/file/17232728686.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d397749d---87022893742.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/65364300990.pdf
    • https://liniagdanskzydowo.pl/files/botipin.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0a3531de790104e08c6e1bb7621f2b1b/serod.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf9786455---99994156512.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebaba31a65---ranakulokexujazaxerasopi.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_off00010645.bin
25fc3c4f0dfbe253c416bf1398537f9d9c0c24955a99dd4cc3a6783d9266d1b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 10112 bytes
font_01_sfnt_off00011cd9.bin
9f10262411ab4c43affad9320874eb01c79713df8acd0533b1d0893bb80dae5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 17928 bytes
font_02_sfnt_off00014bf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF0 16792 bytes