Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa16d7b630c0592…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 05:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce7bca3213fe4654dfcd628be4b991f3 SHA-1: 4e6eb361555be39ec44a90fe162a0e26355dd6c6 SHA-256: 6fa16d7b630c0592304eac31532afd1df94ec9ae1216b969db1119203608273d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=bmi+calculator+android+studio+java
    • https://soi.icami.mx/ckfinder/userfiles/files/vizipuxenozotisazevimi.pdf
    • http://psn-monolit.ru/img_file/files/zixabok.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613126f1bd3d3---zamazovijudepobovo.pdf
    • https://horkolas-gatlas.hu/ufiles/file/rabalirowuwexumusaluveze.pdf
    • https://cytokin.ca/upload/editor/file/21364882288.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe400c964d---kuxajakaga.pdf
    • http://ecohort.com/userfiles/files/30740833009.pdf
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/62461332275.pdf
    • https://kaptenhoki.org/contents/files/68750312332.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/funewejebovulil.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587c54e298---52012606053.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5k878hmueud69oel3krlipndoa/powelol.pdf
    • http://eikenhorstgroep.nl/userfiles/file/tilubedi.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/lidubuja.pdf
    • https://huanghecables.com/d/files/xawukidomuberat.pdf
    • http://mauthietkedep.info/upload/files/mibagibakasaj.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/15858986693.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/jubano.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/volavefalabekopip.pdf
    • https://akamercedes.com/images/uploads/files/pajuzojuzelozazivuzuzeman.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/6472214791.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ce7565b3863fb37e56f04e27968a6280/fovomulekisinoza.pdf
    • http://rsentco.com/upload/file/44017536980.pdf
    • http://balone.net/_upload/file///20048454709.pdf
    • https://perfecthospitals.com/FCKeditor/file/78542218743.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_off0000b7ee.bin
13c9872e4568ef6e99d7e680c425f2855c385fddd24c7e6e4450f9e943abc559
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EE 18784 bytes
font_01_sfnt_off0000e823.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 16792 bytes
font_02_sfnt_off0001003a.bin
dbe189bb7d05ed6ab49a11315a27f4c1eb4eea664517992eae21a364d5920d91
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 10748 bytes