Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95725ea1640ecdc…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 20:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de3d81f0560366d7102c709cec20f903 SHA-1: d634547f78d789e57caebc5008e151106fef2b9a SHA-256: a95725ea1640ecdc12b9c14ac2ce0249d84983bc2c0943c25c637ed94bbbcc56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards 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://medvor.ru/uplcv?utm_term=game+sex+education+android PDF link annotation
    • http://nuraski.pl/wsg/userfiles/2408850130.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/57421286166.pdfIn PDF document text
    • http://na3.it/misc/file/bokenemafid.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109171251329566.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e2cd2236---likosonale.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/13371207752.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/kosekobisodewudaxaxeluma.pdfIn PDF document text
    • https://allianztc.ro/files/file/tomakegiw.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/mazizagalegalami.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/21781203796.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4be79f48---porekuditetovewoxaxaz.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/kopiwig.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091109082473499.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/vupamuzozunusozam.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/6914046011.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/birelogoni.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/lizanexofosemelizikaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614466aa5d3e5---xekazidebi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/dtanaqe1v2is8733nttsvo1ps7/tuvuvipimagexevasigexuji.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/50209920424.pdfIn PDF document text
    • http://actinq.nl/upload/file/tipexefitujowu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/5073592732.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46982595664.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/sasifiwobubobude.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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 18628 bytes
SHA-256: fd9a596a18a2b0924d44c849d38efed4e045ec87d3ed32a51adb3f06bff7b897
font_02_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 10728 bytes
SHA-256: caa8af38c8979e1451272f638fb543e8b2c2b3f76dd64ea39ab613a479c62659

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