Malicious PDF — malware analysis report

Static analysis result for SHA-256 099c7cb98072de93…

MALICIOUS

PDF

127.9 KB Created: 2021-09-02 00:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3df40f0c6d07de065cf8fd2b54e717fc SHA-1: 8ef0d8b98b4737dcdeada83e3d677d3e6f6fba9b SHA-256: 099c7cb98072de93ce9a3299f990785f1cb7c2258a9d3c97c274ca0381a4cceb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a malicious PDF, detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution lure. The 'Password-protected archive handoff' heuristic indicates the PDF likely contains instructions or a password to decrypt a subsequent payload, a common tactic for evading gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=hp+msl4048+tape+library+manual PDF link annotation
    • http://parkergeneralcontractors.net/userfiles/file/giwadap.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/xitifiwo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f71ea24410034714614b14744e333b1d/97759541681.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/89431868184.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/zuwororuvirikoguvaziwef.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68262be4d8---64781383867.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/25601295109.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mdaj2054rr3p0lir10hflhm3ir/loweguzozedep.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3d2f086a1b168cfa653f82b5e0c8a3a3/31917284790.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/beruzamezurubowoxida.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f75c4d949---wetuju.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/lonoxof.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160787c81e240f---61826069073.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/wumumatabubupibareweru.pdfIn PDF document text
    • https://makenie.com/upload/files/62139939318.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e559d6d96d4---fefenogezarosowowozim.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/26310090976.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607573d265ea7---gozixinup.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b1d9c41a---33503616634.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/76982219120.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/povuko.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc82890ce---wonafoledadajewoxabenede.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/2935682627.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/49400663995.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_off00018ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BA3 19956 bytes
SHA-256: 523c11c1586c808588622726d6674aa9d3762affbf74f0ddc7380e657a0b3d26
font_01_sfnt_off0001bfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFC5 11044 bytes
SHA-256: 7e7dca5f188afdf65652c09cd314cd1d232b1cc3ec5edfe5f1542834a56ef229
font_02_sfnt_off0001d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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