Malicious PDF — malware analysis report

Static analysis result for SHA-256 a282c9f449e7b1cc…

MALICIOUS

PDF

87.5 KB Created: 2021-08-21 02:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 744c335a7b963ffc18545e919da1befa SHA-1: 11e69bf6d5e81fbe1aa130011c1bc22fc10d7796 SHA-256: a282c9f449e7b1cc5b55e24455115de34a4068e09556013a7420c55081239a51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The primary purpose seems to be directing users to potentially malicious content through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://contelex.it/userfiles/files/xotuxekinenilopezusasasa.pdf In PDF document text
    • http://sklepjola.pl/userfiles/file/40805212615.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/buvoko.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/kezadedumobujozeka.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/89123030867.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/pilupofo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/us9dbspfdhmjpeb60gl5p3rq7r/tomudikojafitijigopufes.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609748ff5dc2e---19907307199.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/822eb65658e373574531af35e637a505/motixesuza.pdfIn PDF document text
    • https://ikima.fr/uploads/file/20050174070.pdfIn PDF document text
    • http://mobilenmr.com/files/files/dafolawezifo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lcile5s4b6c4ob7fa6qf5arj0r/buguw.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210630074412.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/74afb94bc2503b0cd7f0f8fc035584b6/45357107640.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/sabufa.pdfIn PDF document text
    • http://atiksigorta.com/files/48547286329.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/79653428870.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/bokirevitepugoles.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/pabetovisagutikudabaju.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bb3809245---3211509771.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/zimitudimal.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/95871151838.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bd87315f5ed52309bb56ba726021df71/23393524637.pdfIn PDF document text
    • http://poiskvod.ru/images/file/fujurupobep.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/mesidupalinusit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sermones+cristianos+evangelicos+para+fin+de+a%C3%B1oPDF 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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 19712 bytes
SHA-256: a9048b4a1682244c4c45e9c19094853f502d14d6e494f9b1efb2852f8d8dc62c
font_01_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13363 11312 bytes
SHA-256: 5f46245b2eb1cf5122e294c68cc8297a0ea08c3c729e72d59270d0536a334218

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