Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcab76dde9d4959…

MALICIOUS

PDF

70.2 KB Created: 2021-09-21 16:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31f1a57f9accf044cc904c165319378c SHA-1: e1e7397631d3584ebb888e36c6bf42176df18bbd SHA-256: 8bcab76dde9d49590c0c4fc6bd9c490874ee65c1386c48107837d05e95cbd460
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links are likely used to redirect users to phishing pages or download further malicious payloads.

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://coretry.ru/uplcv?utm_term=pro+evolution+soccer+2017+android PDF link annotation
    • https://oreopay57.com/ckfinder/userfiles/files/80069672876.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/teziv.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/86125466771.pdfIn PDF document text
    • http://0048.pl/48files/file/53736706555.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/49646908553.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/muselivu.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/99372026160.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136479311af3---vutodu.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/zutizawonike.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/16/radizukuza.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9031eaf4---miboposexenife.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0fab0459101fc0667e41105fc98d7e32/xixifanagibopupirigo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/40e41b3fb52df1bd64c6d689752c42bf/vorix.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/13257907364.pdfIn PDF document text
    • http://julianina.dk/upload/file/84590609196.pdfIn PDF document text
    • http://vhz.cz/user-files/82067231295.pdfIn PDF document text
    • http://dr-temt.ru/images/file/moxeroketosewik.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/7024382866.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/36581058473.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c36acbbc33d19ea4a9c8f19c5d8b31d3/35262147559.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/74212113664.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bb673b83406ab2b17d970706f573ba69/wilasoxipapad.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/bezajetafo.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_off0000afc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC0 10876 bytes
SHA-256: 6c45a04590487bde144e4a4be4d6b8a18f19a8f3306c569ac369f1f60316548e
font_01_sfnt_off0000c92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 16936 bytes
SHA-256: 0e988e44e80e2fc4c43d3c341e8e54a472da2dd6c182cfe69b086c7b4a748281