Malicious PDF — malware analysis report

Static analysis result for SHA-256 d776ef2e16e2d545…

MALICIOUS

PDF

96.9 KB Created: 2021-08-04 07:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c1d0fae37c64477a38c85dc3fbfcf78 SHA-1: d6b0ce18ae116328936685d1d97b39123c4d17b7 SHA-256: d776ef2e16e2d5456fb3272987d4bbbb59d23aa84c8c5c3386a8e74d3a0c22af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to distribute further malware or phish for credentials. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://krisoc.ru/uplcv?utm_term=clash+of+clans+town+hall+level+7+best+base PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/gulavibefereki.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8857297a---virewefobuxobozo.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/pifuwogefedi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210602174654909.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4hnvotp4tpj1sg9l4ke1k990i2/97642793503.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/53c723c977e3003ea6a722c58826797f/34916839409.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/fd0e7f4b30c3c04c8d8ba0e77ebb7f6e/63219649524.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/zifagopog.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/68813898811.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/20661079377.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/wuzudimumeneje.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/42798966945.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f7456333---42446441227.pdfIn PDF document text
    • http://philboyd.com/21966649120.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/milevikinewowo.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/45347994044.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f541909e817e290bede470aca79a43e6/79500767342.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160780e06dd38c---zofategi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02611a0a7---29788104059.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/womok.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210608232220_1361896416.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2a59da4602fe7a47994f58bbefb03add/mijibekuneluwokupifuropij.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/57421616713.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_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 17920 bytes
SHA-256: cd5a39915cc851dd5922a64b96200daf17f109f34c3b123cbb032d0096773fee
font_01_sfnt_off000144f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F9 10612 bytes
SHA-256: b5c1aefba7d5e596aeceebc406fdd514bd7755354f111b4b4072ca05f1612d8e
font_02_sfnt_off00015d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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