Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d64861c81e5ba4f…

MALICIOUS

PDF

89.0 KB Created: 2021-07-15 12:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2b5aca166835b1a9a1770f8b4516e381 SHA-1: 2da0f80f188704ade52977762ff1691a7f2762d9 SHA-256: 6d64861c81e5ba4feb99b055e560835749724e9578c9cafc21c5b71c8300358f
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://arohitourandtravels.com/userfiles/file/65379670710.pdf In PDF document text
    • http://10glazsikeyrosa.ru/file/70048402571.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4baa26da---zejebo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc3a78eb9---woxuxe.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/kopixafoj.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/najanavi.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/wababidazosirozukit.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/fibuboxolilugu.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/65202652073.pdfIn PDF document text
    • http://emyorganizasyon.com/emy/ckfinder/userfiles/files/96733646544.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2f2d4a298---vofovubarumadaki.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruwokeviruwewazugavan.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/21297465028.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/44484513850.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d91562e78ffcee28ae206c89a3204a8a/7806881812.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827be4a4bbc---18726380711.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3398k37jo6u2hc1pqjbaj7euo5/10120546610.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070aec9475c6---jaxofiwol.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/76d38d28400306298a1110d543607ffd/34727276049.pdfIn PDF document text
    • http://leguido.net/files/xifolurodibebusatepazi.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/90406852796.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/binal.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hmt7jibnf8k05aovk3mamdnkdr/vopamosajifav.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b044a0129f43bfab40ada096232064aa/24490864926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=home+dna+extractionPDF 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_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 10412 bytes
SHA-256: 969c82fd751c93634a5c68195de50af29c534cfe3611e1be4aafe600c4adfc2e
font_01_sfnt_off00011265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 17048 bytes
SHA-256: 54284316005514b56ee5d0a0615c7dd4b5c72a0831f5d93c8c4a29fe032bcff6
font_02_sfnt_off00013e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1