Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3905e7e111fec8…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 22:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 474b45b3d93764847c4a902237aa9418 SHA-1: 558bfa01e4d66ee8a47119c482bbbc9bb553f121 SHA-256: 1f3905e7e111fec8fa1bec63f06e908e295a5d423737a3c133790b71066fbad7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. These links likely serve as a lure to direct users to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://phrabat.net/UserFiles/File/xuzonubom.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceb2f3d19---81863094108.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/toxaz.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/30855492582.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/nasazefifekaj.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/gafamuxifatopowadulefodi.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/35633287018.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/pawutenabidija.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/27490643221.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/dozenovesazu.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/7545132975.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906154242.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd6a661500---27656819856.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a3ed3d066d99a90894bc7b322b183677/tutinagofuxamag.pdfIn PDF document text
    • http://wawa757.com/uploads/files/57268563178.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/jipelo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a1c8c1ab---kebodefezojubinubumiwe.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/dafirenilarisejaxiwumut.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/liwawilo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908101755.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/disoxadu.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/13231983966.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2c356c66---kekojaduvibi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f921c18788684817edf7164db4986c3a/fimeniju.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/xumipuribox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+music+player+ui+designPDF 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_off0000bca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 10956 bytes
SHA-256: b98569cae768c9d55fff7fdb62abffcd4c480f0723a1700d6d3e84a722ec837c
font_02_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 16828 bytes
SHA-256: 685da794985f93185701ac5061dd3d981c2540f8e3c8575d686376166c6eebfd