Malicious PDF — malware analysis report

Static analysis result for SHA-256 01caaddff41c4010…

MALICIOUS

PDF

89.0 KB Created: 2021-07-04 21:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c751fd983f49fff9ae7601f4dde1ce6 SHA-1: 11250592d2dbb0e648d3c6db2f2c39512acee16a SHA-256: 01caaddff41c401097a6bd9c01acb92d8d7d524e70dfa1d023450a9c8b74c43e
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous links pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a98661806---54581045278.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7ccd43f92a2cbcd171cfe1febf86893/mivebefeguzoxogimimolagax.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/23451220934.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vigotojewelegi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/6un9q0gjqr9emr0sts3hqql5i2/19334153505.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4d519401---vosenedexekonuzej.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/ziravoxametekajidalu.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/q0uppd5f7ordbjoq6lg2cc9v0d/23464383593.pdfIn PDF document text
    • http://sivam.pl/files/file/29519699851.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f7f45929a85ed84d0acbda2490f0073c/tozuwedejexegodeb.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/98991953329.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1mvnjob02481jmgaejh1f8lm2g/77095766276.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0ac72dc04efa4718b88ca1d8f27a58fa/tutipotegosizope.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfbf4b3a97---piwosokebekefefukobola.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/286562009.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/60159520113.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/50878983773.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/70243816001.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/571820657c93f3d52eb093db7fd7711b/duxininulosoj.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/zijagitesijakanev.pdfIn PDF document text
    • http://drironcat.com/images/file/53698426166.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/49893746265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=harry+potter+there+once+was+a+boy+named+harryPDF 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_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10972 bytes
SHA-256: 341c03c979bfce7858f39ceb19fcf595c24cb2ac6285c44db3d8d3df69161471
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 19364 bytes
SHA-256: 9f718713fee193830bd92f3dcc624ca376e3e8986f8ab19e6075441efed886c1
font_02_sfnt_off00013eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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