Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e7abdad054d5e9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 20:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ff542a66b4762e4ae0bf5fbb106222b SHA-1: c52eb3868885069c78fbe8f991116e59a1a9c68e SHA-256: 97e7abdad054d5e949466aef09ffbb28dc4ab5fa96184ea86307deb3bda5458e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://detskeihriska.eu/ckfinder/userfiles/files/74583578419.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/41758106934.pdfIn PDF document text
    • http://humanlitech.com/files/files/vojizulejavojevusunij.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n45g4a4hr5v1qbq2b6spduv68m/82754815653.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/bizazu.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/vusivowak.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d3f23e7c0---zatomeregeburavewodofo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/soserabizetamib.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91ce2c005---71679575913.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/fewemusufiv.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/53283271452.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/54559791534.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309572189cf---waperegofinaxemut.pdfIn PDF document text
    • http://ceroki.com/image/files/91137873630.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zukesapimot.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/41920187974.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/92687400591.pdfIn PDF document text
    • https://blugarden.eu/file/18237794396.pdfIn PDF document text
    • https://claudiodituri.it/uploads/80504995787.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/90412357624.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/43776649348.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/153785350c89c78d573e9ba5dbdca196/mojitajunemuwase.pdfIn PDF document text
    • http://sushibelovo.ru/files/jikokotunemavozaz.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/fujexuxobibipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=brothers+and+sisters+cast+season+1PDF 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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 10524 bytes
SHA-256: 67db6bef364ac3fd849df81b650e3935f43da1db1b940b5b777a33910bf1f2cb
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 19292 bytes
SHA-256: 97cdf1ae88ded5b47450bf73511a1f5105e290212c5fbca9fde62c20ae013625
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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