Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5c92b9d97ef9bf…

MALICIOUS

PDF

82.7 KB Created: 2021-07-27 03:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 431ce8849cf3d6a9772530d9d052eb1d SHA-1: c7ca8f914fe5d5a64f529b9986f0bd14c8a08880 SHA-256: 3f5c92b9d97ef9bfe86909ddcbb15918963a6d94780234b4fffeda1886da41cd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://timeyear-v.com/userfiles/file/87944344737.pdf In PDF document text
    • https://2acontractor.it/images/file/38044246255.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/ribivib.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/d5c9fam3s47nhh5hptcdmtl3j7/92550982136.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/eea1db92484616151ea4798c6ca8e321/zilapivumujufuparekupa.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/60302370514.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160798b89395e6---14703785304.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c599f4ac---17930704683.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c20978e44df---75365729502.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a16a0269f024f05e49ef3e06619e325c/93639965092.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075c662850c2---92026548281.pdfIn PDF document text
    • http://canvangdientu.com/images/file/95307307332.pdfIn PDF document text
    • http://heizler.hu/files/file/32531550744.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/82071276730.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624015059.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8abe6a84---juwolamemuku.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/54527677311.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/75304331549.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4d99789f1d9fdd53aa30cf29e83dc59/59346028849.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/50192457913.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/68ca2b9e6763e1c393b3fe9327a25362/18971022980.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c14896f6606778150ba0b73bafa6871c/91418514964.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9df2a93fa---netamajonedopasixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+gta+san+andreas+pc+fraco+2020PDF 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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 11032 bytes
SHA-256: e8451103ebc9885ff6c55cd2f4cfbac8233da317eb96349a6d090f86a9fe5847
font_02_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 19548 bytes
SHA-256: 895087af045fb100dcd2ccbb0b7ecd6800254535b21bd270e2f860ec7291fa8c

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