Malicious PDF — malware analysis report

Static analysis result for SHA-256 114a3c394fc01e20…

MALICIOUS

PDF

86.8 KB Created: 2021-08-31 04:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 83a6438a1ef99eedde525eacd56ca6be SHA-1: 775e19de1ab1cd3a3e3acc93598a8a3a4f42714d SHA-256: 114a3c394fc01e203a93609960f6813d2f2a171a6249225ac486be8a931ba8ca
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or to download further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://au-coeur-du-temps.com/userfiles/file/72234568578.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4cdb0be70f4393b0bf73e87dccd33c17/58751486423.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__610AF278163CC.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108261945486563.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/21674949688.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/41652831889.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rutev.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/zevudakovare.pdfIn PDF document text
    • http://poetryforthespirit.com/clients/872464/File/5616464514.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1293d363---dexesisanageno.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b2c4cf51ac9ad7815d92954c2ab2e2dc/65732488905.pdfIn PDF document text
    • http://signauction.net/userfiles/file/58835978467.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cd2d4964011f08df1ae483b102df84fa/giremomad.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/44254787846.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c52a95d83ef---jijowilovefi.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xipekejutiw.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36bebfccb---zudele.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/bvuhjb975vaj9gqa5b909qssq5/4037837492.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/jafogej.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/tetogirega.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16112dca0c0848---jobovakutowa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a865008c3396a9e84c85f2bed8ef92e7/mosonabadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=walther+p5+manualPDF 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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 10364 bytes
SHA-256: 1551615f2cab22aa6f93fcfb77e7e55d719a31e8ff226278e2c0dded3a86f88c
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 15548 bytes
SHA-256: b920866b4396870fd2b5c9a968506c5a3d8f05cfee80a37271ea462b14de1538
font_02_sfnt_off000134da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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