Malicious PDF — malware analysis report

Static analysis result for SHA-256 58118c0a7729440b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 08:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59094c6164195c75e55d51a122364971 SHA-1: 34a87d96b72cd25ff35dfdc38325419f187cde8c SHA-256: 58118c0a7729440b0f37984e29742ecd0a8a4e55840bcae71500bd5d1e0b94a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://wastran.ru/uplcv?utm_term=bacterial+growth+phases+pdf PDF link annotation
    • http://myflora888.com/ck_files/files/14996667540.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/faxefufadifelaxo.pdfIn PDF document text
    • https://baptistfriends.org/media/73173038711.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d48b52cc2---jiganoligibasovukimiv.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/nozulawejegerugarefagi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961e1d1d6ee---povivawadikotawa.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91b1b76e3---43643869476.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/becd9baea6529016088a811a7cf80d5a/32452969576.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108231854397667.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/47357383351.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/togupizezonisutezop.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/sudiwolopudimadisavexarig.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/kenelinimevudipilexumexu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/2450397f5dca7f73a262f0ea752321ab/2845071895.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/xijepasamasik.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/jivunujedevodumuwebedijuj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607362bf2b324---96529111691.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/28099227421.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/65983790114.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/kbf5uso15n9mhnh3ar8v4f1hq6/vitodabom.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d2d6ff07ce74445beb2067b02617af06/1459860580.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/wereniwogokik.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3bb4ed7fd93c170d07ded3493fd356ec/74342692007.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/migobalad.pdfIn PDF document text
    • 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_off0000bc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9D 16576 bytes
SHA-256: 8b231e9daeaefed517ca725ba7628c5b505300bacf6b31ad283ecc40988c2a3e
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 10936 bytes
SHA-256: 28d07d6a45e23c33b41de78fbc505e5a3f2a0a4d169453cd959a8ad151bdafcf
font_02_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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