Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfe31a860158fda…

MALICIOUS

PDF

80.5 KB Created: 2021-08-29 16:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 9b3613b2a1b62a190231125a71aab954 SHA-1: 32a42e28751d2d440d2b3dc146a7482ce49f2a0f SHA-256: 4dfe31a860158fda68a847c56ac2ac26b20ffddd9439cdb3d75b6d45e5074900
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malware. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hitecds.com/userfiles/file/67279695600.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6hh0aq5iffgmvbocci0pk64ni1/votogedibusajotiferosini.pdfIn PDF document text
    • https://2acontractor.it/images/file/bodabogixinuxisosisojus.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4ecb43o56kobhje5i55gja33q4/daxagivo.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/41361878308.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e69d2c811f4ef078e45f8baf6e0e5ea3/lamidixezijasutafan.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/kagikasewolubuvosawur.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/57147541350.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a4a445fb10d96207a4cd62bafa244552/90789505545.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/latepexinog.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5d4facc694b141518b9f637594d2d4c3/61286715893.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/2146333483.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3c708068---59615295229.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/62278186172.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/xojanuxapezuxabek.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/21078833204.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e8713121---46110675200.pdfIn PDF document text
    • https://securitydm.com/slicice/file/98069364989.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210621111522_6r863x.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3b7b8cea---66658659685.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/36490739940.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/bifogamonuxakijajaluk.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/fajadi.pdfIn PDF document text
    • http://mq-water.net/upload/14518520760.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/pojurugudojoviremuziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=castle+crashers+all+magic+combosPDF 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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 18092 bytes
SHA-256: b1ca3b0de92bebf84d8cdd77577cc4aa897704f2d6f38d74d5b27884d1d26b7e
font_02_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 10744 bytes
SHA-256: f03dbb1e1910b350a224815f8f7f1ab25cacf749c4ee700c4aab675be1e7f6ad