Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b541e722056f9c7…

MALICIOUS

PDF

91.6 KB Created: 2021-07-24 22:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8524b120661983bc84c8f38dbd8b0d8 SHA-1: 5145571aa70db8919e8fa32fd145540f049d2109 SHA-256: 1b541e722056f9c7b279caf14fe6369b9181456d1a8ebf9c9903624870994593
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0049a9ab29---39110894266.pdf In PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/melozipawo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/dbbdb4596d3496ee1bf24879d15661f0/vezajifuwefixepewaronagu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/abaef11b250f5bd64a409d4916492414/kukirifinukopimugomumer.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/53465423315.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fc65n2v0klfob975ignfth8ii4/ligos.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/mavemudixotolujuforonuw.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/30589641399.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607992e7d1a17---53922701721.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609301205c929---75733302711.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/d90b4feffe7d2c6e73562e2a2afa6f8d/fivenesavosefimezifarop.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/jimibejosazelugut.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/junasapifolujino.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5c42b06f39d0736b865196329cafe725/lomozisapepozexajuluduk.pdfIn PDF document text
    • https://linardi.ru/files/file/gukivigolelum.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/hhecghvmfh31vphvad4fhev06f/83675702073.pdfIn PDF document text
    • http://allasclub.com/campannas/file/37686456219.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/26075443956.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/depatatuzirigipokepaxezo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4c7q7tif4ft0p8ilhosgvag306/16261912796.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52ed7aca8e---81005463818.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/povavusuvep.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608503d777241---sowadupuzuxuratiwudeso.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c0b05e57---52681666850.pdfIn PDF document text
    • http://wohingltd.com/userfiles/dagikisesitavitako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+open+google+forms+in+mobilePDF 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_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 17488 bytes
SHA-256: ab769c3f801fde4371ad568c227390eb08873c986f96a9085260283567570c19
font_01_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 10756 bytes
SHA-256: 003d54ad714ba22849bc93e0b6cb6e61bb1bac27d431927e747a85bf205c19c5
font_02_sfnt_off000148ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1