Malicious PDF — malware analysis report

Static analysis result for SHA-256 326c9d3410101d86…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 17:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffd8f4315d88716920b9aaece6a77841 SHA-1: f786dfd83706e05d9d0bec7d6bb8da9417855a35 SHA-256: 326c9d3410101d86c42017944f8bf68536298e34ba696eed47db34cf05ac978b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to download other PDF files from compromised websites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a deliberate attempt to distribute malicious content through a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161472adc75ac0---wedep.pdf
    • http://cesvil.it/filesUploads/file/tekolorokatokogut.pdf
    • https://nergizleryapi.com/image/files/366259228.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/jovutexowaliximuxakavu.pdf
    • https://artinterior.bg/userfiles/file/sowoxugasalibuxe.pdf
    • https://alakharia.com/public_html/userfiles/file/tadanedu.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161423f4b75a8c---rupomage.pdf
    • http://kronospan-mofa.hu/editor_up/zanobedufifikolipa.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146f722b13ce---89423284519.pdf
    • http://scamps.biz/userfiles/file/24154395913.pdf
    • http://goldmustang.com/files/files/54874963474.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zevasezozugopisosowa.pdf
    • http://king-pro.com/userfiles/files/vezevofupinaxuxuwif.pdf
    • https://jewfri.kr/files/image/files/zugibewisut.pdf
    • http://worldtile.net/jangheung/userfiles/file/97866088653.pdf
    • http://fabtur.ru/upload/files/tuvugeze.pdf
    • https://manhremhoangvan.vn/wp-content/uploads/files/36089064666.pdf
    • http://galluccifaibano.com/userfiles/file/sotadiv.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/32904889365.pdf
    • http://karlsbach.de/userfiles/files/79684647976.pdf
    • http://munnarteabungalows.com/userfiles/file/wabazifu.pdf
    • http://hzbmsj.com/images/upload/File/gegeno.pdf
    • https://triatlonshop.cz/userfiles/file/77434024032.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+watch+detroit+tigers+without+cable
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe6.bin
892af8965ef696e7adf13920aaf347f50d77c454ec05ea40da040ba281e84a1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 18244 bytes
font_01_sfnt_off00010b7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 16792 bytes
font_02_sfnt_off00012392.bin
a604a981abe1d8a10febaaff0945683cba3e07079f37a7e5bfa7b563ba184891
pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10864 bytes