Malicious PDF — malware analysis report

Static analysis result for SHA-256 986bd75941a99805…

MALICIOUS

PDF

117.8 KB Created: 2021-09-04 14:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d98c0c9e9b2c1332dbcd11ea88d5fa8 SHA-1: 72a4a62423998f9dda56728c5664c6a3675de386 SHA-256: 986bd75941a99805ff1f97f1969148aa8c5001c160d6fd24d2644b2e4be7969b
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

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 https://ketchas.ru/uplcv?utm_term=walrus+and+the+carpenter+poem+pdf PDF link annotation
    • https://aydin-elektrik.com/resimler/files/livivisuvonekezikipokofa.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/fumuribeborezov.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb57c0f02---dixugozadamugen.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a2aff025cdf5ba067073d5c0adf1606c/luziloluxafubekeponadov.pdfIn PDF document text
    • http://usagimatur.com/files/others/bigajog.pdfIn PDF document text
    • http://canoeing.by/pics/files/siruvejowox.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae2497757f---kesavudowax.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/61633833207.pdfIn PDF document text
    • http://www.heksan.com.pl/file/wanufuxaw.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/saponimivufew.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021081104484173499.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/mufoginumifewap.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba1768a03---fuvodebupigujaropisa.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/91467858470.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/45751848888.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/69986165173.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/42969218404.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/12630625168.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/buborivuxarimepipadu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106260021.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/19223730307.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93c9b3b42a2d75e61a0c05167a6406c5/6554434865.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/14159444017.pdfIn PDF document text
    • 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_off000167e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E5 18884 bytes
SHA-256: 591e783ea4146e2b60bd1cf631bb4d28661dc575fa2b453651f394a8f1e75c50
font_01_sfnt_off00019835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19835 10888 bytes
SHA-256: a30e7dd8a3ade47aa290ba7f0593c188c225d7f76e083eafeff4d7c21faecabf
font_02_sfnt_off0001b134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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