Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e185427278c1c53…

MALICIOUS

PDF

156.9 KB Created: 2021-06-29 23:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 50798cc0b1cde16d92fd16c808537786 SHA-1: f574f3d054914544ab039405c90ca033030e73cf SHA-256: 4e185427278c1c536a530cb4c0acc8ef454eace148fb36dbe8c092e6043d0283
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms. The embedded URLs suggest a phishing or scamming operation, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://garglob.ru/uplcv?utm_term=countries+on+black+sea PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9dced393d20c3cc1629564c5f792f297/zidajewadinupulu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390a220691---89495683644.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/63020496336.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6ef9bb7b9df9a454f4f4e7e70d5d732f/xijasiwonutuzoxerep.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/bimedizonorizemutifatune.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/lofijawotimotoze.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210524051415.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81853db9bf---50128515921.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B826E696607.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/ladopunogusolodapifexi.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/15835711066.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f0a3dab132c586a5b8bd4bd69b24f8e8/69224830154.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1619d7b1---37096827086.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b10a0d9a4---76177808764.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b6143b5cd41618e2277246db6badf5db/titulawurepu.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xadop.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098503906719---gufinaso.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/lekadibowapivudibiwetode.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/44991419754.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/vgut9acmop5rageqlj5egnc7r1/58152450183.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/t69k9on4q0f97u3j38mp66mg84/rerak.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/femapo.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/vuzuzifatonigalevigel.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/sabezuzupaxosak.pdfIn PDF document text
    • 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_off0001da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F24F 10588 bytes
SHA-256: 617569c4559f41fef87a1066f1798dbd4ca9f39308f736d4c0ce74cbc1d1e4a2
font_02_sfnt_off00020aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AAC 36972 bytes
SHA-256: acd72390286516febb8d79f526beea5850820d0f924e1a028a79444312804a75

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