Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca366f6f4bb7352…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 17:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3fea4304669932ab0addc8410fb17f6 SHA-1: fa3db45260900017c8842d648b379d6241a3c82a SHA-256: 7ca366f6f4bb7352449ed251bb3e4ecaf4670d585c9e9193f134724934ea1d87
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://iucecb.com/files/file/48933832627.pdf In PDF document text
    • http://ural-resyrs.ru/data/file/tijimosame.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/mixobujiguxekoxito.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/6352072018.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/70800340082.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/61637277301.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/94893410065.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/16770894449.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/pujoje.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/sefenogazidareno.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/fibubibotixoliparorone.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947c6560b8---gatixevenajarunupepiwi.pdfIn PDF document text
    • https://duvanco.be/docs/files/tomike.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132646bbe45c---dadovuzewimorux.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b5v1p5fapvk02dm4uii5o1j6i6/janetuxabitode.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/17902445137.pdfIn PDF document text
    • http://tcihk.com/userfiles/8029571528.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/71682417012.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77723277198.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/22952635378.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/78815307261.pdfIn PDF document text
    • http://moneymaker-gold.de/files/jebapup.pdfIn PDF document text
    • http://isvpro.com/custom/files/25953402560.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/160dfb6d5c1a3b0feba2e5cfad35532d/kebiwanubakojo.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/22445514985.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popegaduxudimurumesimap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+10+storage+sizePDF 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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 10592 bytes
SHA-256: aafd2a82c426604c0a27f1bf73e26d7ac54bdf00260fd10b4178f3fd40512bb1
font_02_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 18340 bytes
SHA-256: 9f005163465915cfedadd5986d47064e1e92739875f1b51494a175139d700b1f