Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a91a1029358905…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 19:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a77dd711bb4499aa5d67cc5b2bb1e080 SHA-1: a211958cf1b100b999f8aa86c8fe194ebbe5e406 SHA-256: 82a91a10293589053388ad708a43715a6ba4a481570860b0cc29fd355e10931d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs pointing to potentially malicious content. The presence of external URIs and the nature of the hosting suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00e35de31---zowomifipiwapo.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadce97ada---99189242616.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tes6ldmr92bkgqjtasjss9ehgi/47063582917.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/fd18f9713a4e0f6be93f94fdd1368f26/doparotupuvobapowitavuru.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/39819505986.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbd2fde242---25046948256.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096854423c86---pokukawebadavofisugimafon.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ada4ee300e7bf6a500c5701b73887d1e/koluguwuk.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/58557256075.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9199531f5d---45664282415.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d1db41dd---94674222802.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/50238512899.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/48979009861.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wofimutage.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/muzaxepatazamorig.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/85809366673.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/numobuzepilixi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/acmk020eehrog4nfupcla9vn98/15971184130.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vumiveduvavozaz.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4jj3p43b9kp2vdfcrfi3pvihqs/zugurofulemavuresedobo.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/solaxexurudobarene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=black+with+natural+red+hairPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 17188 bytes
SHA-256: 98de1b7724ca0995cb977c4875e6ec58691a5068a5c351962fb1ecf2b5ee953d
font_02_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 10512 bytes
SHA-256: ad3a7c9223ea4296afcf8032d1900ca83e27bc2911864d099aa74510065e1d15

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