Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae35dd1bc847a00b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 23:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 48b85be4848cab3c9183c5e7fb92429a SHA-1: 59fc2e9e2e65a8157c97588b48254bafa9e2b943 SHA-256: ae35dd1bc847a00b4f4d1731660b9fbc2dfccd5a8cf98691ae01b9858643f386
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful 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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607333e7608d6---fejevomefemagid.pdf In PDF document text
    • http://feynburg-uhren.de/uploads/segusabijoselabonumenake.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/29266816307.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5o0tvbcbb0bqpnlujgeg2sspo7/modikifejeruwezewokisi.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/xekawumosumuxelibaja.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/29458288001.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9789b53313311b40201318b2dd1586c/sinamimaxug.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/20871699950.pdfIn PDF document text
    • http://amandamaitland.com/images/file/burugovubopukow.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/xidit.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/xaxudinu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/62899594087.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/xibenovonipoxolijajituwid.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08847a67b---93538775412.pdfIn PDF document text
    • http://quaint-house.com/79109468366.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/65367719535.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/6f00df8d688c9c18d5aabf0dde84126a/sogunoleno.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/99828715260.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/buvabutatemekubideno.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/zofizinuxiweresolewifi.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/revuguxinolonep.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160905a0371e8c---29306387996.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe765f50c---jolimijajemuzuwedoku.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/43564740266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tn+10th+books+pdf+downloadPDF 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_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 10728 bytes
SHA-256: 4d083ba293589edb6c76af421d02ab59bc628f0ca62a7fc800d5dd9c0af57c3c
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 20508 bytes
SHA-256: 40951cc2d2a023fb0518e3adcacd2b6434f16d3600b0e8b2ec33424bb789a795
font_02_sfnt_off00012903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1