Malicious PDF — malware analysis report

Static analysis result for SHA-256 989ee13d837ce561…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 19:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f95c83ab05edca3ef5d5b49a860d4930 SHA-1: 5d79d2d9228af62083bd91d87b44bed6710a5ab8 SHA-256: 989ee13d837ce56172d9eb5f4d7abb0afeb27879d24b5aa4b65bfbcd5ceffa5f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. These links likely lead to phishing pages or malware downloads, attempting to trick users into believing they are downloading legitimate files like 'fifa 16 obb file download'. No scripts were extracted, but the structure and URL patterns suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hefcom-hydraulics.com/ckfinder/userfiles/files/13459536657.pdf In PDF document text
    • https://ctapigroup3.com/contents/files/21953529571.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/miruven.pdfIn PDF document text
    • https://architektor.ru/uploads/file/kenanoguku.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/nivopoxilefuvizu.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/54235030102.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/xolamosefabej.pdfIn PDF document text
    • https://tivicom.vn/upload/files/53714063108.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/suxaxemedivogafewerebul.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xajikewitiwanujuruze.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/navukunifewobatalagij.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/zamewofejufuvamawo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161458adb24874---2292871378.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/74c9bfadf13fa5858c84abc783744719/20913124915.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/82749852671.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/samasak.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/18597171818.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210919045311.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136b99e9f1af---xobegisemulinidokoti.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/53785754798.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/30288454062.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/mobexesitudujirodog.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/277ef3a62611251a1c2e3d013e3cf911/vujejuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fifa+16+obb+file+downloadPDF 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_off0000bf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF38 10404 bytes
SHA-256: b0ef68ef85660ea5ff14d6ffa21ce928589e9b098107631fa5d113b3e094c8b5
font_01_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 17704 bytes
SHA-256: e294758f6102971cc9573ca956e6be75c588cf155ca7637a2cfe4ac2dd695229

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