Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad72c78bfa077c3…

MALICIOUS

PDF

88.1 KB Created: 2021-07-07 02:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c3ad9fced47809006dd90a3a9dfa9dc1 SHA-1: 05ab6ebef83a9a1e86eb2d12c2c98fe5b02d9b1e SHA-256: 0ad72c78bfa077c38b82e598eac0369330aec62cc9cfa0ab43a5a00b03e5219d
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. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites. While no scripts were directly extracted, the nature of the links suggests an attempt to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://guojingmall.com/userfiles/file///tuzizajixidudemi.pdf In PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/953c9855d8aab5d85658e8e155e4b3a0/fabubozab.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/k20gs78ni76jmrmhqdk6vp5gn9/xikefolowukijukatem.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/l1tfks7vn62fi5am7tl5diafkf/31345325100.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/56364122433.pdfIn PDF document text
    • https://cape-electronics.com/media/file/29541227015.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/76175226767.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4dd00496e0---fifasovonefujolumuvemug.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c853b6bb031---rivawituk.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/povorivol.pdfIn PDF document text
    • https://susta.vn/userfiles/file/rupaboji.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210609_230929.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6efaec71ef---vuwobaviliwekukaben.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a3f946089aae17e01802835a77b9d8ee/bodetux.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d6bfa7c9d20876c322e9b9e76a5d95cb/vedozagekanopepugaxuzajer.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jdn2dvm1bj2060epqhdod1q021/gexovarelikozajefemepuboz.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf3e9066a---paluseparipubukiwi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vgo0iuj5oimeb7p4kns9abjov9/xivatiwavuvukawuwesez.pdfIn PDF document text
    • http://otohonda-phutho.com/upload/files/21047850156.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/94b7b54d825ca543d5f3afc85fe43d4a/naluxamolud.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03d474e76---8762629688.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/85093100511.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wakomiritotojajude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=horn+fish+nationPDF 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_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 17288 bytes
SHA-256: 9d210a692fed25e5f94642ac187daeafd208ceebd0a0ab5228cfc966a0d411c9
font_01_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 10124 bytes
SHA-256: 1a0ef45e73c0a633c556cefc85a6315627a5c26273feecb9499afc8a77d11480
font_02_sfnt_off000139db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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