Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c96f66b9a07be0e…

MALICIOUS

PDF

88.7 KB Created: 2021-09-14 12:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 799b440ae2a8edfcba7f15aa5c77cd0f SHA-1: 523889cbf32d566ac2ec5318203869d1bdb8321e SHA-256: 7c96f66b9a07be0e47f6741af3541242d51988db73957ab1cffb362217f8857a
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a remote support lure. It contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of embedded URLs and the overall structure indicate a phishing or social engineering attempt to trick the user into initiating a remote support session.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/30734956086.pdf In PDF document text
    • https://poolpoint.be/uploads/file/31340798984.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/26547046641.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f4d8de64e0b3f47bc626f0ed8abf12d7/losunatabus.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/74873ddff52cb34b067743af99917a0d/vesix.pdfIn PDF document text
    • http://boldogelet.hu/media/40869278868.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210914082701.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/nuzakakinexinorufometukag.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161354b9100f41---69735898180.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/pemafebabotilimi.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/gawagulewipuvexuwofire.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/pilozubozub.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/96182287515.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/68023276189.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/labirakodegeti.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/64355165608.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630630685/file/nerojakanedanab.pdfIn PDF document text
    • http://wohntraumgmbh.at/gabutanalo.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/36691489293.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/19253296891.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/nafale.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd9414982---lubipofawivexonul.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb2f96418e---tipadoxomotejuvenax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ipad+windows+remote+desktopPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 10636 bytes
SHA-256: a2443b427083a36ae1a6cbcbec8f22e92f8f466f0602014ad1331034091807c4
font_01_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 18712 bytes
SHA-256: c6ae5954649419eaa9de693f201dcb7c2d3874454ba8accf3ec23e56b9dc5199
font_02_sfnt_off0001332c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332C 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_03_sfnt_off00013c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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