Malicious PDF — malware analysis report

Static analysis result for SHA-256 de343168e9273c07…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 10:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06168b5e7a9f916f4fe6ca6920dba769 SHA-1: 48ddc05ac760b39cc05b13fc4b7bab19b08d7216 SHA-256: de343168e9273c0783c7ff59caa4963811428cf3abcf6fb1f68e7e32fca8ad20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to distribute malware or phish for credentials. The presence of embedded URLs and the nature of the link farm indicate a likely intent to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://tartak-monis.pl/tartak/images/file/pogelixisibakepatipe.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140767b2236a---8306487071.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0252146001631134434.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/57998048044.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/19302451851.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632617199.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tavumunafixivenubunosiled.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/72590345564.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/vutofumufonolip.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/10703273246.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/gemolarinam.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/96557595842.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/pameja.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/35023768117.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/pubafozurefelo.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/50827746475.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/sakezolavilunuta.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/32939692381.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/75285223701.pdfIn PDF document text
    • https://evabizz.com/userfiles/file/6264706442.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2bceda0f---detuz.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e341b1015809bdc14ce585c56fecde23/natekadesuwareradep.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/fovideferij.pdfIn PDF document text
    • https://binhvi.com/upload/files/63468727685.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/81230813440.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16147ebfb0c56a---97873307696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mario+multiverse+download+apkPDF 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_off0000b504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 15628 bytes
SHA-256: a49e6cc1500419b6e2aa7a98b38880a6f335bf3ff54b3a0671531abbeab4606d
font_02_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10888 bytes
SHA-256: 0827a446de7ec1a1e046a35a1363f9f96f02ca88c0cac03aa1b290622e660d5e