Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b2a42eb194102e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 09:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35baf36b3ea48e26166675badbd0a9f4 SHA-1: 3a12cee08139a26c3598d22fb68fb88e7bb2f8c3 SHA-256: c5b2a42eb194102e8cbb154d73953dad24175306e45090aa99536f2ef29f2297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or are part of a link farm, suggesting an attempt to distribute further malicious content or phish users. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=oracle+database+11g+pdf+free+download PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b12f288f---vedusoxuzugutomevok.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/segibaxadegupeguloxum.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c25e476d4---37946962691.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/99914461511.pdfIn PDF document text
    • http://packamate.com/userfiles/14994745227.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/47073025337.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/miropil.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/36026853611.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0c3488t2g785m5jt8q9mv10v2g/wupixax.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355c648732---80425839717.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/29562836223.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd5746ba04d---vokuzagudixevigenadalov.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd2f414b6e---towelisikulazuravoxesu.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bivupitirujod.pdfIn PDF document text
    • http://progetec.org/userfiles/files/pofesexevolebe.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e0718330ab4841d35e8fafacd2682543/fasixasoxaz.pdfIn PDF document text
    • https://bdata.vn/upload/files/59015665245.pdfIn PDF document text
    • https://rm-parketi.si/uploads/jebitalifamibipos.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/tozapogoduvifonaxuz.pdfIn PDF document text
    • http://susutour.com/userfile/file/kimosebiso.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/82772408568.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddcd6cf121---86421824363.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 17992 bytes
SHA-256: 0d8cfd2f448d7e2f66a5cfc6898cef9aee46cf1daab97a92b603a06ea6cb8d53
font_01_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 11004 bytes
SHA-256: a233faf8869283781e4aff180abbfcc9e1cc9977ec530fa62a828055e1b1cba1
font_02_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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