Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea2afe5beb2512f…

MALICIOUS

PDF

94.7 KB Created: 2021-07-03 18:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4863950900f10ac1c3be8ab47b5b531 SHA-1: 8c847e8d29e0d27411486f896f5b25c75bd05f84 SHA-256: dea2afe5beb2512fc3b878791f308effd50c9b026fc6b150f1dbce10fa7f7ef1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://learnazia.com/fck/imagesfile/fanedikiguxedonoxad.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c910802de81---tunorunuwugilimuj.pdfIn PDF document text
    • http://imaginove.eu/data/Files/rifuvagos.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ce6f7e2e4251180f56f926bed7426506/23161949514.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf18aa1bf0---85216714661.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060800332893.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/82264817059.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/23661050625.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/musafogafa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a082c5fc---vanemekopaligoz.pdfIn PDF document text
    • http://szwygs.com/upload/sujijununuxas.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/xevupifakapasex.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/gigan.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb770c83---kebeluzurazibe.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61669ee77---93002310966.pdfIn PDF document text
    • http://soupworld.de/upload/file/bigavukuvi.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/9d9caf8be5d331a29876777b864c0cce/75158084923.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/zafazezonamadidunodi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18283787---bojenumupepisu.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/32814090622.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/fejomorijafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=indefinite+leave+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 17080 bytes
SHA-256: 3516b711d8604161b4981fb2bd2ec3a4b3034ff47d84e157eedf2cfc596c13ef
font_01_sfnt_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FA 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off0001566c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566C 10328 bytes
SHA-256: e7c589640ce97629aef2745addcc00e2be2603351b9b2592e6e22151c98a333b

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