Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae916ef1cd2ac49…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 00:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90393b026bd6c2c5fc4bee7a7e61e463 SHA-1: 791dee6cb828375326a70159465824c151854048 SHA-256: 4ae916ef1cd2ac495a86622ef00362f3bbd7141f53c3f0911da461df4840d0d5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.rapn.ru/ckfinder/userfiles/files/bozebilazor.pdf In PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/pp1lq12hjd6958k3avup36qe3n/tanetuwupize.pdfIn PDF document text
    • https://funbugs.ie/files/file/59264356290.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/44270553395.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b16c684b---41439137258.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf06cf4ba---32833705583.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/betogo.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/kisejajufirepuxalot.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d122ed617e---52020244502.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/vefijekamisapemutoletaz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6fabb52f5569be82d81ccf5d0ce3f701/34881147993.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/96610200865.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/lexabajepelavogaxuxulinez.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/gubufo.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/dofuripo.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/29179931310.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/bijokulaxemukusalabamaga.pdfIn PDF document text
    • http://honda-vo.com/upload/file/20390271590.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/g56ninv633et637h72h24roe60/zabemuziwobeb.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/xesixuxatuvetekogi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ce80f19e0---tanowawozotabir.pdfIn PDF document text
    • http://houselandia.ru/files/fudasadagafenuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sport+concussion+assessment+tool+5+pdfPDF 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_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 11088 bytes
SHA-256: f259666879376b75fde414512a468b92d1a7e1d3101f7723ac631fe39d340ed9
font_02_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 17556 bytes
SHA-256: 1b0b9b6152b3f21f9c1c60ad0ab92f8390e9e2edf0c9e0a809f811dd8a821a2e

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