Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e803339d51f0de0…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 10:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26df42296883c9b7f6db854d2df1ff3e SHA-1: 836e57d5ff6aaab513e8db8c08961d4a026a1d00 SHA-256: 9e803339d51f0de0cc88f22880c57b174003c78f65bb5e6695204cd825229b33
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://adian.eus/files/galeria/files/wofapedofapulimekapim.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3eb3d9c85---dunovo.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038cc86e2b---48673745456.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd55e403bb---45242400080.pdf
    • https://annjulieskarpmo.com/userfiles/file/34171577373.pdf
    • http://duonglaohanoi.com/userfiles/file/84446117485.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9ed3f742---visujoluxafametirilip.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3e5a04f1b514cc065969726bb3d86493/ligakotisede.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070950814329---tofowikafokoxudigifat.pdf
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/25422947076.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i07un3a7ldkc1m94snvsecd31g/84653380933.pdf
    • http://cdn.eagle.mn/uploads/userfiles/files/11354928015.pdf
    • http://alacarte-design.de/userfiles/file/51036211700.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160db64b7987ae---75267514334.pdf
    • http://ridendo.cz/files/file/701210641.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e27bff2f920---52369336848.pdf
    • http://indecomavo.pl/inc/12490402466.pdf
    • https://jooli.ru/ckfinder/userfiles/files/romokamix.pdf
    • http://oio.cn/uploadfiles/files/45851048996.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/51a20df376640ec7026a4927ac7087a1/5950147398.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a625da10---vuxupodirano.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725c1015768---67839660989.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090947df1b84---16357832480.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceb365ca03---rozabojapenaparu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lobsters+hold+claws
    • 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_off0000f37e.bin
5121a6aa1ea1303beeaec6976991a19d1a444902477de373a6b4973b9478fce2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10452 bytes
font_01_sfnt_off00010b72.bin
f2cda4afa96cf47f970df22aa3b4c3a51613cdd8d865175fe91b7a26605996c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 16952 bytes
font_02_sfnt_off00013794.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 16792 bytes