Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc646dd6d91e77dc…

MALICIOUS

PDF

102.6 KB Created: 2021-06-25 16:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 310132abb4b3100a8c286d64e235ac56 SHA-1: 35b12aba6c3bce44f5321772c45e50245154149a SHA-256: dc646dd6d91e77dc986cd36002b0cc42fb7d5caf5b6ddcc7150cd4b427914000
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains, which are commonly used for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://oniceh.ru/uplcv?utm_term=milotic+egg+moves
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93133562232.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a09f3427b---57447604491.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d263ae2f11---nezukegiginizev.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d02bdfda---49204050626.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/38866394969.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6a878969---xixipewogumorevixukoke.pdf
    • http://www.vljainandco.com/userfiles/files/pekalagijak.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/57gt2h1tvmurn63d3j97s4at93/pezubaserudoni.pdf
    • https://pui-vital.ro/msg_media/file/62760578509.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/h7ujha312ukav8q3rvvud79meh/24257906269.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/79baff9f27993dd9b90138876679feee/46563096963.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/adcf92e99e976cffba4dca037382e579/41260161016.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a30f095520499dd9a207cf739fc8fb2d/83734367786.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c9442b50---57131883361.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/71cb6b0d89212f0cf7b1d2c0844e5960/47115202981.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 16792 bytes
font_01_sfnt_off00012662.bin
9707891eee3711d630bedfd21a356175a845c88259062e7ac6d7573ca763a568
pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 10264 bytes
font_02_sfnt_off00013d81.bin
ff6cc8d34b89a99e6d816c7518e4398175f03ae0a9509b7668fb88f3a740bc44
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 1992 bytes
font_03_sfnt_off000146b3.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x146B3 16160 bytes
font_04_sfnt_off00015c28.bin
29413abe0291f4e32b22defff33e67ac9f24a1de19a4cd6b508737075d2cc7b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C28 18684 bytes