Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca22138747c11e6…

MALICIOUS

PDF

92.9 KB Created: 2021-07-30 06:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24d4c3a69a627d428a1d0c06f35d8182 SHA-1: 6717382831c6b1bc75118e6c36f741a0f6a8ab58 SHA-256: 1ca22138747c11e6d740673d87cc32f309c1acb9612f51eb97c31809b1f2fe69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many hosted on compromised websites, which is characteristic of a link farm designed to distribute malicious content or lead to phishing sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, but the presence of numerous URLs and the heuristic findings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://anvlaw.com/userfiles/file/28120781978.pdf
    • http://honda-vo.com/upload/file/29506827787.pdf
    • http://emeraldcovepartners.com/_data/images/file/70989386259.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lgthu433baoj60favoelq898h6/4486338012.pdf
    • https://preciseenergygroup.com/media/tamomo.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/557d5a453c384df852e62c20cc59b259/72243445615.pdf
    • http://jandebruijn.com/uploadimages/files/waditebuketuvalulitu.pdf
    • http://clinicaveterinariacene.com/userfiles/files/7168430322.pdf
    • http://kayapaliinsaat.net/file/77518606393.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cab23b5ac7fb1eb15d5946d3c8536201/zewomik.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/nuwojemotepopanazupibowu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b85767e7b7f---12308380886.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd76b48dec06e3153b67ff0dfec4ff81/povipelinibozagiketigo.pdf
    • http://rauvuonsach.com/images/uploads/files/24413064048.pdf
    • https://fuoriscena.eu/file/40150678945.pdf
    • http://malbreil.com/userfiles/file/50111774906.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609603589f15b---9093136.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e494da120d1---sijiwalomotoji.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607304e04f7a0---95240321596.pdf
    • http://nappsa.org/userfiles/file/69119829053.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/0d901ccc387fd5f79b988e1ea1718268/56775653624.pdf
    • http://whalesart.com/uploadfile/file///2021061504540684.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3bc7a08a---32638775682.pdf
    • http://babywagen24.de/userfiles/file/6797591415.pdf
    • http://mrbossamktown.com/uploads/files/51693198223.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7822b1083d---69196833271.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=why+was+sat+practice+test+2+removed
    • 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_off00010382.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 16792 bytes
font_01_sfnt_off00011b94.bin
13fb07bc3e59841cebc2a5a8abb47b3a085b0c6f5513871ed3b41f886f1fc328
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 18092 bytes
font_02_sfnt_off00014a8d.bin
accdc0fd57ca8a25699c003cbfb0736686ad9eaa4ebd09a729622a6687e1c885
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8D 11008 bytes