Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a835791945e1d34…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 23:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53e4928b733fcc467ab60044fa747926 SHA-1: b348f35b82820f084ffb33d9dd6ca6fd4c54d82f SHA-256: 5a835791945e1d3441d27a4071984939e263b701f9b6fc9a26ab3d9c781af274
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing or connecting with remote-support software. While no scripts were explicitly extracted, the presence of numerous URLs pointing to compromised CMS uploads and disposable hosting suggests a phishing or credential harvesting attempt, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://philabc.ru/uplcv?utm_term=settings+csgo+for+low+pc PDF link annotation
    • http://okvin.org/userfiles/file/56409714263.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/3137469110.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/sanewo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/36706a864af28422df36affead2ef40c/80217858563.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k0n9413ngeld14o2sbdvcgi52q/lezubitevoveto.pdfIn PDF document text
    • http://yuhongzg.com/d/files/89257088021.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/54593738914.pdfIn PDF document text
    • http://techbis.pl/files/file/14977755495.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790da7ba339---rakobunenunipunebi.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/23269950146.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/91978399130.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/08/file/202108170322316232.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6db2446fd7d98f705f781ceedbf64a86/subapisududewozefar.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/fujubixopunukaboba.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107ad3727404---41981360663.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608916b435615---tidonow.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/mesonen.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/q3733hc6032rcvlt09vmeshka6/laxuzodumis.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210802_396DB99F21F5D45F.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c06dd961d---94129158519.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ketolusawonun.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/vibudasib.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/tapowuwusizuraveloronilo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 10656 bytes
SHA-256: 488210fb257a389403ea62e9e4e85cc3273ac2269abcb8a765f161f422d3e2cb
font_01_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 18728 bytes
SHA-256: e84000d987ecb3fb515379be8ce1ab2717295c61995b4fd0aab26ea79f0a7661

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