Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f03d4c05880e92e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 06:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de77432acb10b953a950cbfe015493e3 SHA-1: 77dfc3f0f7c6d6fd0285e43a1c4a236e33d4851a SHA-256: 9f03d4c05880e92e1e0b8ef77d40d8d783a09d389b07f6f53685b807e0e2d3cc
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, as evidenced by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The embedded URLs are designed to lead users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://zeminyerkaplama.com/upload/ckfinder/files/99910715737.pdf In PDF document text
    • http://cargologicru.com/sadm_files/gemuzotekiso.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210903143904.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021910112411190.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/50390168655.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/41935604955.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/25399449350.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/tabax.pdfIn PDF document text
    • http://retailcop.ca/files/sonekoxerexutejunuwemajob.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210905213847.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/suxipo.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/nususor.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/tafokawilodog.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130a014ce270---delosikisugijisukub.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/93155704406.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/rizijepotofivuzew.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109022115117112.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0c0ce18b3c94d920cf7a151672fcebec/9400271885.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903191349_yk9i9k.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/92577508402.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/68403824133.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910093836.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9afe0401f8aabcc78dd52efc39759af1/riwezenilebis.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613002aa71d81---zuxijawibixunobo.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210904165239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=smule+hack+vipPDF 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_off0000b7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C3 10384 bytes
SHA-256: 005a86d80c5ea50d7730470cc52710c4a6428ddef256ff13a151391b9911604b
font_01_sfnt_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 17204 bytes
SHA-256: b77872624542379d8d9b8fde369a0f73e4f35b92081f16d2609408aadecebb53

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