Malicious PDF — malware analysis report

Static analysis result for SHA-256 5751aab2dc9f018a…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 09:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c3a97447ae390728f85cbb32d908456 SHA-1: 66e8929c0356de3332a23e6f56f6b7d3fbad2753 SHA-256: 5751aab2dc9f018a9cf76832aa8424651f6f7488c055f7193d237ee56f15d0b9
156 Risk Score

Malware Insights

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

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 numerous external URLs, some hosted on potentially compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.szphotar.com/admin/img/files/16082650806.pdf In PDF document text
    • http://millecolori.it/images/file/dabopeto.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rajaketu.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/wolebilogudebib.pdfIn PDF document text
    • https://bagstyle.uz/images/file/lepokoxobefamojisuxu.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8fc32357a105071b6ff54ab1c0cfe936/wasuzamunefalelexutejoxev.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/roleta.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/59647338881.pdfIn PDF document text
    • http://373113.linker.tw/files/10171581624.pdfIn PDF document text
    • http://spiregene.com/image/files/20210827_220818.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/27395435035.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76572cf12---lamef.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850bdba205---jabebe.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/56428201770.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/fewasitejuzaf.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/738017282.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/uoj0vdg8p118aa1udih25lumd5/87578797285.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/66913580318.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o9v5i386h3hqd70gsh1m241e4m/sutuwujidafazerokibe.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/64188422851.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/wirewopusadivovuwurufido.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/17265k2a49sksga4da8o4pgsh0/30240313066.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ba988250157705f3b11b5d4bf25a3d9/27713438562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pert+cpm+network+analysis+pdfPDF 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_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 11076 bytes
SHA-256: 043f721374e68a6baf2aae75d8bd70742dc029f165d7b2c007c4ce2b50e10131
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 17772 bytes
SHA-256: 6115a762fa71632ea8ab3915b309c41243da706367ec56c82527cdd7bf6d1b2e
font_02_sfnt_off000140c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.