Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78f1a7b8f5de14e…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 22:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e68c9acd2ad5ac1600596a436da95923 SHA-1: 0b1b9578798e99a45ffd7328740eda394e9c0b8b SHA-256: a78f1a7b8f5de14e473970f865e15e65ae6e968dec04697f82fb2de2965481db
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. Several of these links point to compromised WordPress upload directories, suggesting a tactic to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=mushaf+al+quran+pdf PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160867e629b83a---61701185811.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/12714123208.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/vitafizagixubulupul.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/56342232330.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/xilififixudunakemisax.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/46228013336.pdfIn PDF document text
    • https://shopabrang.com/images/files/29498585175.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/tunopisire.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/woxibameve.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff3f2b03f2---sebezixerufavola.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16128dbb4c9acf---zupuzirurigedulataku.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79d5279c6---70760152715.pdfIn PDF document text
    • http://halmar.info/userfiles/file/52685742802.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pebvgnu9npgrl57e4f30a37oi4/3100598660.pdfIn PDF document text
    • https://promise-land.com/upload/file/xafefumetegebazeteniwuj.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b573d613ecad0cf16a0b57b39a82771f/wowosiwukuraxum.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/58086940844.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/7360633988.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/41410552515.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b2f3ecf91950f4dea9d1502817535d4d/tadivokijuzifenarusisumi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767630264ce---68796314665.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/movologutazuguvax.pdfIn PDF document text
    • https://actorconseil.com/files/file/20934029239.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8847c1757---xukinofibunup.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/78737340563.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_off0000c26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26A 18112 bytes
SHA-256: 45bbcac1cd59d463ea1f5c34c3866d55b268e87a8f60d55ce59a3edb6db8c927
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10392 bytes
SHA-256: 08df73d967957b9bac822ee8b87875f601c84df1351046eeb880317e93f7d1f7