Malicious PDF — malware analysis report

Static analysis result for SHA-256 763427d167f998b1…

MALICIOUS

PDF

98.8 KB Created: 2021-07-21 01:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be51f671e4ec1e8c98c46917680e0feb SHA-1: 7812f2c797d1424b34896a356ae284fdd3059eb2 SHA-256: 763427d167f998b10ba593f1eb95a421946269a7c44864c117be271450c09e09
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2e5e1d08ccf76e84d6f250c58af9f09d/siminubamaxujugo.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/tilawuje.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82a33f00e---xuvexi.pdfIn PDF document text
    • https://tonitomov.com/picture/file/54985988089.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/kisovarefaj.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24134a1d3c---49493654070.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a7006b457eb9c401e8ed01f0cac1f33f/pajewiwuzodirogivotupapal.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c2ceeed6---japireli.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/jovovukupivuwibarozawew.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7089b577e8---tezosiwenezawilebutor.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/57876668176.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/pudaneribapikatebo.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/91190836047.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/92436414202.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a77c9e256b8bb012a5357ebb820c5459/38421976530.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/1953248599.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/weliperuvobufaw.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160789e51c7b4c---49720462775.pdfIn PDF document text
    • http://cga82.com/admin/File/28638680675.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/gibenatuxirawawejew.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/10603633113.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/52226586781.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6427809eed9933323c22a6775f74880e/sivakilono.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fekoxirixax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=browser+private+apkPDF 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
stream_005_off0001513f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1513F 24388 bytes
SHA-256: e608153425b3c60649616fb73a04a75aa0188d3b4df4d67751d0ecccc8a4c8e3
font_00_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 10392 bytes
SHA-256: a060833da926eaf631955de4c08a0254cde5c43a1379f4e1e7d936cfafa6d736
font_02_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 17628 bytes
SHA-256: 4c771ad361037ab6be384e07d6c824d79f6d8da92aefdbd541f14346eae0542b

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