Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44ae779658d1927…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 10:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7281f6db1f33d37b0999cc9810a8ceb6 SHA-1: 2f5225c6d1507dcd1188e00a2e9b8d10fe20022b SHA-256: e44ae779658d1927a9fc78810903320bdd7f0ae4432176aeb18669e5ad46ece4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bostaninsaat.com/image/files/92261780345.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c530efe3737508c26a19fc24f0ab48fb/52406422200.pdf
    • https://badanie-wody.pl/galeria/file/53098865204.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevudexokapisuler.pdf
    • http://evpltravel.com/xv_image/file/pufikaxeja.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rovlt1fss9j1pm21tc3nil1no4/bitexaxawuxame.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/36456487382.pdf
    • https://chaletsuenodesol.de/files/kexuwazusud.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/74681007365.pdf
    • http://dansecyr.ca/pdf/file/71521455307.pdf
    • http://sapientgenerator.ru/files/userfiles/files/bezim.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2b40e444055ce08a17cf2d0cceeee7e8/vekofod.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/digidutawekexerurofemob.pdf
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/78926972260.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/90614330593.pdf
    • http://xn--or3bo5mvlb.com/data/editor/file/11782192784.pdf
    • http://aescantabria.es/upload/fckeditor/file///devofepakobemudow.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140363f9eac5---67064550109.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ohrijtovutnd1ont37mcbdsd53/jemigozexekujoxunajoki.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/e13ef7e33dc73ab913acd73cd042413f.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e687f7fb---wilerutanolajapitunolaliw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=racing+fever+hack+mod+apk
    • http://s250801404.onlinehome.fr/img/uploaded/file/50314625629.pdf
    • 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_off0000dc3d.bin
6d6c80a4b46973dc517bd5416b5ee52fbb172c809aedb93babbdd3604ba4d820
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 10960 bytes
font_01_sfnt_off0000f545.bin
5e559222e1d398c303226c6811f9d1f2f32d4779bd842f5e01f90a3ac1e76462
pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 18132 bytes
font_02_sfnt_off00012421.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 16792 bytes