Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b97e2de66cdedd…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 15:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46a718cdbd2a1163d68750e1c82647dd SHA-1: 24f7e9420c5048400c28844325f27939755bc08c SHA-256: 62b97e2de66cdedd4d8a63eb41d9ffd50c0d5590194795446fd51f2a68aa7beb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's purpose is to manipulate search engine rankings or distribute further malicious content. The presence of a URL related to '8 ball pool cheto hack download free' suggests a lure for potentially illicit software or game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/xupirawififodugenusu.pdf In PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/7221891264.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/momuvowofalosupuwagof.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/96812668803.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/52823403037.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370f77ba79b---42404628513.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/20759190269.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/fuzakanuvewamad.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/dusogiboboxofovumuxabagi.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/tefadukaf.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/varozak.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/54997881377.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/59487492693.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qnsf3fflo68vu29q97uhnnpsg5/jobowowerufumelopujizekod.pdfIn PDF document text
    • http://rrarental.org/upload/file/xijuw.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/76787018346.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/48320438187.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/tivagazolewaw.pdfIn PDF document text
    • http://krupongs.com/images/file/24196337557.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210909055335_560vj8.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ea89b28e700e662a78aaa5bab0a21547/tawaminefadit.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/10437269011.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/68680242241.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/42784954520.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/96440750082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=8+ball+pool+cheto+hack+download+freePDF 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_off0000b790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 10888 bytes
SHA-256: 396fa9da31f1455df865eed7ce7d29878b046f35d7cbd4ff621245c1d961e3bc
font_02_sfnt_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 15260 bytes
SHA-256: 4fb3816687309ea7677729c462e713eb4ca488ef0a5357b61904da1e2a4a1012

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