Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d79fef57f7c163…

MALICIOUS

PDF

88.9 KB Created: 2021-08-02 04:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e28c4079dab09b410612c0b4120da44 SHA-1: 049c6410b8f32d1e72d814a5f2aa3c9171dcda94 SHA-256: 42d79fef57f7c163424d67a78580d98a1eb23a97fa6e1695ff1da4693b56693b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. This suggests the document is designed to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ed45ddcf2---85950468889.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca5630df57---lavedokomo.pdfIn PDF document text
    • http://placc.info/up_image/20169893060.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c8e6d655a---54383095149.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/cc9eb10fa39dc09c93ed53bacd7dee68/75499652443.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761535b27fa---joniwebebiwifuvizelo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d74637d3---bepiza.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tiranijoforuzux.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/87861051259.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/xozotu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afac7f13b9---13142572517.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/82391613712.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/b2b535c4b3284d2dd345980e8e8e10fb/nigut.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/bujizi.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a040cbe2a1a073fb92bc4e5f3a7ee4b5/lolegapenabudopodo.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/89387788296.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/op9p19o09v4l9q22hgnpuf5o96/gekojepawisijedozagesenal.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/be9b64ccefdc2376676ae52aa6bebdcc/25669174578.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/eb4e6408039df936796374ce33ca753d/derizaweleva.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cb7951dbfe---92433847040.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/fopazirivoxokak.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/97aaaf5303ecd9323e3eab68d28eb59a/61327052904.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1340096c7---70317834392.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/82096724622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=who+makes+grundig+tumble+dryersPDF 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_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 11136 bytes
SHA-256: 46d9b0b30312d8446a3df4bc4d48ecef46ff83958214d6ee2e7ec2b1f65920c8
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 17024 bytes
SHA-256: 932894743a9c7664635f12f23dac3276dd287def7c6095e8f2a77f1610e77e69
font_02_sfnt_off00013d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1