Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c08d30bf0d08c77…

MALICIOUS

PDF

85.5 KB Created: 2021-08-30 16:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c41d13a71b2398b7ce23723844122e3 SHA-1: 4ba14cea29e4bd63478691a20c973cfb8f74792b SHA-256: 1c08d30bf0d08c777faaf520d03e806a2fb7f991314faba571457b744a57f6d3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a campaign to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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://thrifthelp.com/flash/thrifthelp.com/file/11145778328.pdf In PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7b07afc9---63683335842.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160810236a9368---tapukujadutulotezuka.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b85134cb5bd---wegivaliput.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/tosafovugefepesiwegakaxi.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/ruvugibabi.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/fufomiw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7b1fd6f7d9a238f0a7695d1bc36d254e/74595923370.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/81955085366.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/62270850941.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986b75c039b---5335481079.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/bkfdqt2f4493onpagqmsenpd66/nenifixupuramaxudixasuti.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/dixexiwezozuminakumiko.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/buwoveviv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe340d1205---venegobitov.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be40342e55d---88988187379.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb3c0434d---68974053521.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/puwepagal.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd94c7d6d9e---fepadu.pdfIn PDF document text
    • http://citranco.com/users/files/14384344320.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/57320418904.pdfIn PDF document text
    • http://protok.pro/upload/files/6771720469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=concurrent+liability+in+tortPDF 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_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 18092 bytes
SHA-256: a3dbebc5071558485c33c2cde84aa27c5178e939292b5e0d25553f03c1f95da0
font_01_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 10440 bytes
SHA-256: aecca4f19546ca8dab87c1b59a149bf546e9c246e0ecd045fb6ffe3be5e3cf90
font_02_sfnt_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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