Malicious PDF — malware analysis report

Static analysis result for SHA-256 5335a71febd4c277…

MALICIOUS

PDF

111.4 KB Created: 2021-07-20 04:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 41a1deb30b371ff2a3c867ce8900aad9 SHA-1: 935a4e8d3ecb2b2d97cd774ffeceef1ed7352dd1 SHA-256: 5335a71febd4c277f30b5e693f8ab3ae537f97e5d2ce641e806b94305691ffbb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to malicious content. The file's structure and link farm nature suggest it's designed to distribute malicious payloads or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/18v3umb3prk38jgt6t74sbvtjq/gabuligovumovazokugisoli.pdf In PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/fl44ilt5li9v29uj1a2jtd9tlk/1628420034.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xikoloxuzesamerazono.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5aa2b647---xunabap.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/9685484415.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76e32c3c2---33833492163.pdfIn PDF document text
    • https://bnovum.hu/downloads/8195702395.pdfIn PDF document text
    • http://didula.com/img/file/serotadufesof.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709900d81e0---11695625664.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/jexafemu.pdfIn PDF document text
    • https://europartner2.pl/uploads/vupozudabig.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kinokixaxovi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f525a92ad03---93456568263.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092042c6322e---jipuvafujefararigumexokak.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/18281395536.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/94613674587.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6c59249906eedb4c1d1443a1e8ebb9e5/lefiferekojepikugeju.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/zomedefawuxepowugupazab.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/31124649989.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/38410695061.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/33ragivu1kn1cpv4vs2j5hjp70/tofudabobebekafur.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/97957762939.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3b33bba063f81d7d8c7eeffbd228787/mabivudolusesiwenaxew.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/1335636340.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd8939375---tetajenididotavuju.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1d8dba009---moxeroko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=doberman+with+tailPDF link annotation
    • 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_off000152ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EE 17636 bytes
SHA-256: 1dde23e3da278eedeb2ccb5212180474f8df32dc1ca9dccb2b7e2470a289e01f
font_01_sfnt_off000180e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000198fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198FB 10432 bytes
SHA-256: 2f5c21daef4529eae90837454a4243ca9acbb778f5db3d6152831e9d450da1bb