Malicious PDF — malware analysis report

Static analysis result for SHA-256 370e95a3fd48e79a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 00:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5463e37595847e352210150c7a9ef429 SHA-1: 3aaae9b8735011972207c71160063ad45864613b SHA-256: 370e95a3fd48e79a23d4e7343b2ff2a45c58448dc5fbf2b7a1211955ce5e3395
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the heuristic firings indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0b02a432d---9930039889.pdf In PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/36654232394.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/nakoxinivekefe.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_F0E30B74329A4F17.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/64019812353.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/70404433502.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/19545650614.pdfIn PDF document text
    • https://beaszemin.com/files/25160643717.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/niviputowebuxo.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/41016147516.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/xafugo.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/95043246499.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/18451685360.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/jowaketovira.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/dofijakevazuxar.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426f10d19a4---jufiremifadaxif.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/lisevefo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/364f0e0f5f7bfa4b2403c9fb29c9fa58/57542526202.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/suvukagom.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/30052328407.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8205d46c---32986999535.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/63229787104.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/bujaxapuxumexuwozuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=discrete+mathematics+and+its+applications+6th+edition+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_off0000c1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BE 11052 bytes
SHA-256: 9bf74ce8270f75743636039f4e5d5971d1de971572b64e40ca7e2e97a5beddae
font_01_sfnt_off0000db45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16420 bytes
SHA-256: e13ea03cd95400e45f80a7f71b0cb7a9ca3e6b1883f30a1d8e2e336a2ea98881
font_02_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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