Malicious PDF — malware analysis report

Static analysis result for SHA-256 de98105c8698fb04…

MALICIOUS

PDF

98.2 KB Created: 2021-07-24 00:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d2817d97f297d7f8d7331df778d2e7c SHA-1: e51a2fb302d0bf0a1074f422d817423514d13af8 SHA-256: de98105c8698fb04b0c778e2c227eaa5ffaef37ae32ed2b5f6bc416f349664d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing and trojan activity. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc99939eb9---vizitafoligagulajij.pdf In PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/97092360161.pdfIn PDF document text
    • http://wamer.org/userfiles/file/64602373685.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/nibipaxifu.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/33923939257.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a9cb3104---66756422251.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/d269b1c20b5428556bc43e699528fc47/tigesun.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/18635940876.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/45205bd3d8bf4eab9e46174c048cbef3/25210842043.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcf3c7e3f3---95871661126.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89c329bb3---tinefitovugokozobuvu.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/dalipewetoka.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a56cd8e8c9f0c8a0507a1c318a3df43/51841500203.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7a53852v98dv0lccpscivce3mn/kadadirugel.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/97167782813.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768993418c0---mevabaxugovupuzevo.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/wovatev.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/giwawerulut.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/garujodugulujedilu.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/68794679488.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/visifikajivawa.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0d68307fd2b5f56a4fc822e9a0e5a144/rikuvovegagezizegolilim.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/moruxepiwituwegepowubapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=%C3%A9lisabeth+vig%C3%A9e+le+brun+quotesPDF 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_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 18320 bytes
SHA-256: 3dd9381366506aabd4694ff9dba1c57e41a691955429c142d9258f1603f5c4bd
font_01_sfnt_off00014a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6C 10992 bytes
SHA-256: 1f65d46df39fd3b16980e45624d74f80da981fe59b0d2d4781a731d106914164
font_02_sfnt_off00016353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1