Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccaff1e0feaa2bc9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 09:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb1ca981588452adb0f273eb515d781c SHA-1: 2bf182a131c8555d5678327ec5e39936fd081ff6 SHA-256: ccaff1e0feaa2bc9c336ae2451c53f0b04b96fe9add061867952b4c128f07ece
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 reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

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 http://lsmtrontractor.com/upfiles/file/20210902063032.pdf In PDF document text
    • http://specialcats.nl/media/files/55366007403.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/79813668789.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/78834336556.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-9/20210909190723906685.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f55653d79---66207638972.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/dukuxosanigop.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/38955059701.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/86877166588.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5a2af3af25a5c06aa0520757b8550040/22818608999.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c8cd33dd---78643841937.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce5305a9---65289005547.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/15186607239.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/vawibenonagebuv.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/40987976863.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/jafobagerulurovapo.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/powogovoxevupupoxul.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/duteg.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mitunalunebedopatijikaxo.pdfIn PDF document text
    • https://km2804.com/ckupload/files/38484762809.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/8496812285.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/68100354652.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/jalipisinijamevajewegixa.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/36619680814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=valkyria+chronicles+psp+isoPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 18656 bytes
SHA-256: 96d0a91b207e5161ef416c26d85f65933cb8f874040433158ed9bb394131b4cf
font_02_sfnt_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 10548 bytes
SHA-256: b50555a6e481e574024159ef55cc10a5ae1c1b419b0bf3434502f6fdc7532e1d

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