Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac41d86df3ccdc01…

MALICIOUS

PDF

93.9 KB Created: 2021-09-06 11:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e39e3661b853fa2caff7843aa866358a SHA-1: ee244646dc63249b47c239a39f89090336c1230a SHA-256: ac41d86df3ccdc014c61a58ce61388b04765881fd3d0da66335245eab69fec1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=possessive+pronouns+worksheets+2nd+grade PDF link annotation
    • http://strandedtattoo.net/file/konatozoxojuvaziju.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/sexofeban.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/pikolosimuwojufewisonelog.pdfIn PDF document text
    • https://kapefashion.com/files/files/ginivonutidawivesibezuset.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/demenijij.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wisukajajalane.pdfIn PDF document text
    • http://sivam.pl/files/file/xenitawigawefalorebuzodiz.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/xiduwesekoposekitefebuxo.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/mufivurojunolafuwolo.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/66225373153.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/tagerafuxebe.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/19377267507.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/51367391436.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/busoxurosozewuwewivomagi.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/98409655638.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cf58145de448d15d7a36a1410761c016/zusakekol.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929f4ef33de---15463630703.pdfIn PDF document text
    • http://apcmagon.com/userfiles/87380196325.pdfIn PDF document text
    • http://topstec.com/d/files/zosizavivalode.pdfIn PDF document text
    • http://3will.org/soubory/files/kigevigedazitamo.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/10895990797.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af240a10e---52142247320.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/389249214bd4595d77aa8a643666b164/puwulamojaduvukevajif.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/webidoruxudunubaneve.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/85630541197.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_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 11092 bytes
SHA-256: edf7d383a339932c0e59f5dc2291834431f6011b1e73fdba224725cb61f62992
font_01_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001370d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370D 18756 bytes
SHA-256: cf2b0c638fc35ab52c1c5399d2108a72a9f649c564de05657da04ade430c082a

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