Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a91e40de5d1c5f…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 01:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15ffec9afdcdd2d0e228c1eeea3d7aae SHA-1: 41b005a689b789ecc839910f722015c7a21159e3 SHA-256: c8a91e40de5d1c5f80e0da60faba9a55672444f41bd37de88f0d6c2da0334d5e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=jai+gangaajal+full+movie+watch+online PDF link annotation
    • http://nowyhotelik.pl/userfiles/file/18765451205.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/93634714375.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/48f61fef43a58ad34bb24a1c0b75e88c/fikirorizukefofulesax.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/669a698f1d309996192fc730644f4f1e/jumexirugojeworadavos.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/folejovoradumuno.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/59990413228.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/67369426436.pdfIn PDF document text
    • https://tekartltd.com/upload/files/zeviwafudesokobidefajumu.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/84497999729.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/dumevuta.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/42647177809.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3tnuop9osptmpok44a112rdec5/79157207418.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/penaju.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210905005314.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/fadufunitale.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/37645075068.pdfIn PDF document text
    • http://glttek.com/userfiles/file/83983382616.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/92728853530.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/virizudasadete.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wunofuzufedeguvume.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/63732795100.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/69163434093.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/jisuzo.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_off0000ae61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE61 14564 bytes
SHA-256: fda5312530a9121e39fb298eff911c594f45a25cd16f5adc82b8ab8a3765a26d
font_01_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 10888 bytes
SHA-256: 26e7b6532637c17715c20297b9ac91df7b6385f72863bfe6a1ee82ec01a7b87f
font_02_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1