Malicious PDF — malware analysis report

Static analysis result for SHA-256 86686f79d41b7576…

MALICIOUS

PDF

81.7 KB Created: 2021-08-03 07:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52a37a7857e97db4383eb1bdc5c9a89d SHA-1: 8bbae2eda854503a32c3b2de37c0dd4e04d551f1 SHA-256: 86686f79d41b75762dfea5621a217da74d2dc0389e17e1f3bfb8e40ec595d0a8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farms points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=zombie+strike+cd+key+codes+2020 PDF link annotation
    • http://homeopathyhongkong.org/files/rifed.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbac5nh6d8cgut1af8upb9u6ir/suvakolifo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/mibagegijinofova.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8497075644---8329952034.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d69a012d50---latafemavovizodofadur.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bojiropekegivusowave.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/46928181898.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3846a8dd5---66084506922.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608255454eb92---66476744644.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1rnbufb26kkqfq4mdupmf8rae2/fidesidesugafimusupuge.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/kesifikigegejerifigima.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/88976286267.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/digovakefedufa.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/65587751859.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/25501960883.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607de618838eb---levofapuxoj.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff164af89b---96937978592.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/joxipex.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/91516733264.pdfIn PDF document text
    • http://learningkey.org/userfiles/tasujafigu.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/fca181df855d899e4152e1a42b0fc6ea/91264552545.pdfIn PDF document text
    • http://kfbi.ru/content/file/vukoxazerekeviwapudiluzux.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a16ef4e2---43006482988.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf649b6e5---fuzulunapu.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_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 10768 bytes
SHA-256: a9046811ed9d4120ce1f7e8249adbaae421a0ccaee7d872bb4bfc9697aa0979c
font_01_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 18256 bytes
SHA-256: 18587b3db799493f3994fedbbfb160e80af84f412bdb0b4b852be4178bdbf6dc
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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