Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f51f5748f01e7b…

MALICIOUS

PDF

104.1 KB Created: 2021-06-30 11:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 010198e13d003f78a6be42e127baa083 SHA-1: 98398c61ddac8f38dcda72fd98cf7b5fb351b136 SHA-256: 77f51f5748f01e7bce6697ccbc605c6560092f50d60e541d380546a028eaa333
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's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607439dd7fdd3---jokepemixewixerepoz.pdf In PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/92218235388.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f36c9d30---zefozevumamopizofamij.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5f01cfb875fcc224f13ea87ec10b1cae/49872390785.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093a526ac8f8---80639112379.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/6878254184.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/28961232808.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d9c3dc8b1d6.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24cdbfd24837d71151e6981492286456/95001158780.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gvdktesmqj06hp7hjd778djn2n/noxavasabo.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/xosorururabikisusawo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/40517266889.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/16863131894.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c8da812edb37905c9b6c4a2b8fb542c9/weribiwerijavarefedisepez.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/83403982736.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/v76bq50ecf3u7a1og3utdapvt6/49354984787.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/45059712295.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf841b37ca---doxojazum.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f937d9bd---zepasuliwobureritoxu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4709c6a7---bavuraladafifolul.pdfIn PDF document text
    • http://temple.mo/userfiles/file/79066230639.pdfIn PDF document text
    • http://jngf.cn/files/file/61820511188.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/64180b4e9340c2d47e74c30e4af11270/51464815677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=crucible+study+guide+answers+act+4PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 1812 bytes
SHA-256: 05d9845367e5e5dd9304a130293577b94b739a287304f4af602c3221ea6f7413
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 22100 bytes
SHA-256: 5c54f6effa076da6edc63434e84babd874d93dcf623ae4ee76aecdb9cb51a570
font_02_sfnt_off00014949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16160 10972 bytes
SHA-256: 7bd69c709ee72aa48716595e2404f258fb05a26672a69e29e36de177aa90e887
font_04_sfnt_off00017ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE3 16560 bytes
SHA-256: dbd369f27aa76992589f8935192a2e4051727a7396770e6519d60e00b6d5b4c2

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