Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea3cdeeb66d67ce…

MALICIOUS

PDF

73.5 KB Created: 2021-07-15 11:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e37cc3bcfa4f01f54c14ae40bc924ecd SHA-1: 6f6951dc7674c82953e9cedcaa4c6a33e54b8e01 SHA-256: aea3cdeeb66d67ce1d4b9c4f93546eb3df95f79f3619a73b985444858abdece7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, consistent with a phishing or SEO spam campaign. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to the document's function as a gateway to external malicious or spammy content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/c1dve14o0upditjc40m1adir10/57884918143.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607da14eec9d8---bajafetixajexiv.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2160c768b8f59285de37508821be35de/62675832922.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/mo1ng9jhq8tu64c3jaek2luf04/vigedojidajovedabederiw.pdfIn PDF document text
    • https://purefeeling8.com/data/file/79578175372.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/i3p2q3h4d0vpspop66bg8rlgn5/juroderigefetomekiwenunak.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vesek.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceff13f03d---dinikazexiruvuzobisa.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7cdb0ab65efee91ea965ba90dcb74d95/34424613191.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bktklbv3ojnajpghvp6ph2gauc/geromepewa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/rdik04ndt5ofc1o2c51l14dbct/xidokurikaxemiroxiwisugu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c96acecce69d5549de09127be85151b8/sewokixeguvidisa.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/610e52899c0a1ca28faeb31adeebff17/vutitasojevegoziva.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wunebasuj.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a39b5d686---wakun.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p6l5ch9g90tnc1vioue6441453/65318523897.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/lokipexaleke.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b8f7d33da---28804663255.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/poxexigorerelefanu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/rimejivovu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/79907e491362c4af757c354cad848ef8/wujato.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/sflsjrie51st8k4jn17tmv40ai/sokole.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/19368908875.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe31c3942---68747444046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=evergreen+publications+treasure+trove+workbook+answersPDF 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_off0000bc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 16260 bytes
SHA-256: 00528570231ea91a1d3ad1d8665360600f577cfdce8707d30c04cd880d3cfd57
font_02_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 11016 bytes
SHA-256: a0a17c1493f158a287c62879d4af1f256014de8085d5302f52ab39319e00d694

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