Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5a65f2efd8fc4e…

MALICIOUS

PDF

88.3 KB Created: 2021-09-23 15:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 150bc46991d0d2be2eef4ed420aeccef SHA-1: a70acbb44fa24fed07f1defada026e72dbd4c0f3 SHA-256: 9c5a65f2efd8fc4ed2aca94eb1ddb979361d64a6f4b7c73fcb32bf65ca919f8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or exploit vulnerabilities. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39c52a531---wiwewu.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/212a15e1f110d62e548ee7f6205da62a/xenogin.pdf
    • http://zwickerfoto.hu/_user/file/632111309.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb5e2776c8---53690957985.pdf
    • http://alburigiott.it/userfiles/files/80133694129.pdf
    • http://budropol.de/Upload/file/60509664585.pdf
    • https://cordovajewelry.com/images/file/65489044977.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/58non9id4977i6ogo07ftc75m4/lapakazunikisimeva.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210920_082004.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/sadegosodanipofu.pdf
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/75079938739.pdf
    • http://yuanjiangchem.com/upload/files/99876659211.pdf
    • https://lensmam.com/userfiles/file/dobolarigoziruvika.pdf
    • http://ssss-sangam.com/userfiles/file/lenofin.pdf
    • https://hidropomp2008.com/uploads/userfiles/file/22069890921.pdf
    • http://www.rify.us/cms-uploads/files/zubazufowaleritomibugojet.pdf
    • http://intertexmedical.com/userfiles/files/56092263562.pdf
    • https://gifarlcm.com/upfiles/editor/files/43171943020.pdf
    • http://marcth.pl/media/fck/file/pubijelenin.pdf
    • http://knowleangling.co.uk/ckfinder/userfiles/files/59958061017.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jelaxovamakivawav.pdf
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/rokajerudakijuvobujozoro.pdf
    • http://gewidor-gmbh.de/uploads/files/kotekugid.pdf
    • http://ersenergy.com/UserFiles/file/79024998207.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+change+open+with+settings+android
    • 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_off0000f35d.bin
75ff700c6cdb1de6b04e2055c74c0cfe0a34f6737fc34e743ff05434d47e774a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 18268 bytes
font_01_sfnt_off00012257.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 16792 bytes
font_02_sfnt_off00013a6e.bin
d7007ccd5e75bc55912806b35a1f55ca7f3f0733d09cebf0b9dbb4822ef6309a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6E 10824 bytes