Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65800c9e79b67df…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 01:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 123e349fd25b43028cd492430e609e5a SHA-1: 02a487a40c110ba257fe95f5625184430da65597 SHA-256: c65800c9e79b67dfb7086d39c0cf8716aefcd4ad620e251c5dc78cf218ba6b43
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the 'SE_LOLBIN_RUN_COMMAND' heuristic point towards an attempt to execute commands or redirect users to malicious sites.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/a5rqdma9jlge16bo7kf3llcqb4/bujagiraxulag.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/mofatamogopebofi.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/3003845783.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/55720536659.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/56881830526.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f4fca0032febf2fef2bcf522163cf6ac/94693040972.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/kiwigegavoro.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/zezasizuvemujogazabe.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tovujogavanilumokivo.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/botisenebigufasuv.pdfIn PDF document text
    • http://qdcmd.com/data/files/buwiwidedibozizigalu.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/55033933921.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/lorutalomugipudoligeneno.pdfIn macro / runtime command snippet
    • https://fluffy-chins.com/images/file/22579844487.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/dapisorero.pdfIn PDF document text
    • http://proxima-design.cz/files/file/52428030781.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/43471392255.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/89725532757.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/remukamoxagujojefejuzax.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/80170240108.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/34140192950.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a82d8f225---tuxabogemuwefedibaze.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/79666638884.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/17444730830.pdfIn PDF document text
    • https://noventa.cz/media/files/file/2103314025.pdfIn PDF document text
    • http://quick-thaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wps+hacking+appPDF 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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 18468 bytes
SHA-256: 3cd08b43206c53104de834eace75e1a2826815283f1957a267d4cf34cd8d725b
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 10244 bytes
SHA-256: b217532b1da641992a3ad241c3bb4b6054c8d2eda33695bf2a46da97ebd1d70f

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