Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1f2591002e03ae…

MALICIOUS

PDF

91.5 KB Created: 2021-09-08 05:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe38045e0eed9c9b9a7944a73becee60 SHA-1: 1b0a983c149d5abcb797f527d69c2cfa980f40cc SHA-256: cc1f2591002e03ae62533da4f0b42d6345c15017bd969137d58f619e1a1ea981
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lead users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential SEO-based lure to attract unsuspecting users.

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://nomylo.ru/uplcv?utm_term=rutina+de+ejercicios+para+abdomen+hombres+pdf PDF link annotation
    • http://jfhcoaching.nl/userfiles/files/15133857116.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9cedb358bb494f30036772667f9b190b/86654604032.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/pokopubaforotataraso.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/26449148069.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4323bbc7---53007051601.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add3cf76393---gerabixebokipogufipogod.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/37295633615.pdfIn PDF document text
    • https://landbar.com/upload/files/tujasamawe.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a0d735ea7---31000081557.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160758e9b10e19---kafixirakabizus.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/pigumagumitenizaneritiju.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/72995905595.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/f4k2hj0ibqupeghvappqv3205e/fifavigogerelojar.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/1864419154.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/37269333158.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/270a745d15f06a4ffc7ba7cd2e244356/20184751055.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093d15943a22---diwatesaroduk.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/62868066903.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c16a103dccb323eafda048477ffeb5f5/jugumufenit.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-27/20210627095823321919.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/77389116563.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/tipoxuvixunuguwaxuwakeg.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/1399768995.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/59219624956.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5a00e88a---fojokufugoxufod.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/toziderabe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 19080 bytes
SHA-256: fa7ff598bd98b2f7ad0dd961c2e02aaaca9553ebf4f0e050cd1df5abcd5505f2
font_01_sfnt_off00012e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14658 11256 bytes
SHA-256: 0ac759d15adfe32182ad5254c8668daf2ff82c471e9010eec62fd1a42657a105

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