Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3138ca1928d4cb8…

MALICIOUS

PDF

114.2 KB Created: 2021-09-02 16:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fc31baddfd98bf276d9b453558b36b2 SHA-1: 4409adddc6f90e23f8860e5cd10e63a892398314 SHA-256: a3138ca1928d4cb8b3c64c4c88bd715e5fe36b1dfad3fa90ef4f9d59b3615c6d
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised CMS upload storage and link farms on disposable hosting, suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=fallout+wasteland+survival+guide+pdf PDF link annotation
    • https://abhimaninteriors.com/ckfinder/userfiles/files/28177156561.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jetuzuvenifaxibapulo.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/92648824748.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a256b3b41fc---lazokiwapi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/netigidi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16074f7c0c64fb---23685473266.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/17633975498.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/730009207.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/26016324568.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098227cbc102---98618952884.pdfIn PDF document text
    • http://dentherapia.hu/files/file/75603373093.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/84214736498.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/h9q38f02321qd4tjbi053kttsq/dunawanokabidavotu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jaua5psh036sr1th8s2k1euru6/33951096296.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/39136689458.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612dee2b46490---47742605625.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/99363787863.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aa30aaa7c09---gedugexixepururaw.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb355bdcb0---33930797243.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/relotazuzuxesedakafumi.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/sawowupo.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/tepovubetemaxemifaxad.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/93592497360ae08862dca8.pdfIn PDF document text
    • https://castel.ro/userfiles/file/67863466191.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/76842781376.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/98658775426.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_off00015921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15921 10900 bytes
SHA-256: f326800f5429768ea585b338fe25b4988d68c81c5c129ce5d5d87708e574b64c
font_01_sfnt_off00017253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17253 18488 bytes
SHA-256: f80d1185fa9986dfbc951059bb58f4ab68364b6a31901e6b13889999883b2b40
font_02_sfnt_off0001a2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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