Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba129ff01605a74d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 21:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9f6b2cc5f89d73255c70195b1c8fcdd SHA-1: b1ca1d53e03248c8e7279c0f23d4c184a408efeb SHA-256: ba129ff01605a74d31d1eb0e0c70996e4b605cd8a6b6e47a02e56dfe412cc777
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, some of which are identified as potentially compromised CMS upload locations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://szymonadamczyk.pl/uploads/fck/file/5842071711.pdf In PDF document text
    • http://unsersohn.ch/images/file/wipawuzipesaxeligepaz.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/41650215014.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/16594725904.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/22861993943.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/36776890826.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/33326673505.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sizilipiwevobamubej.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/10471451608.pdfIn PDF document text
    • https://robodom.si/files_vsebine/87727923176.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pibon.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/gufamabidi.pdfIn PDF document text
    • http://villkasz.hu/editor_up/genogewujud.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/32461247064.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa97afb5c---gevefi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed34f4707c---86769492329.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/simejev.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/92015182521.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161438874a2e87---41773130349.pdfIn PDF document text
    • http://cocoal.com/uploads/file/menugunolugizevowutaxo.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/vodebofefeganinajit.pdfIn PDF document text
    • https://ijp2.com/contents/files/46085547282.pdfIn PDF document text
    • https://profm.hu/files/file/lizosure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=suicide+squad+480pPDF 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_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 10768 bytes
SHA-256: 4da4f89f24b4b0ebec046836f6f49367108514521cfbcfce83e6f46d033ec83c
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 19300 bytes
SHA-256: 55d3553bb67f32eb81f04d1a0ce357db8dabfdba970cffde29f2ced45f2cacc9
font_02_sfnt_off000129f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1