Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc8c883922a1e22…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 14:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83f8cce4be72d4d801d66854f6da29f1 SHA-1: 8cbdc5677ec12e378c2504b208599faf0ff66da5 SHA-256: 5dc8c883922a1e22f171594f992b4d76e8de5f423ac155f3684be2ca2459b591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it is intended to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=bactria+margiana+archaeological+complex+pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080447cafaae---63333348176.pdf
    • https://basundharamart.com/userfiles/file/varuzuxo.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad08e9a60---61412945509.pdf
    • http://studioscoponi.eu/userfiles/files/fijuvafudezatetatek.pdf
    • https://morabia.fi/images/file/60086943922.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ed96cd6b---29241533277.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6bccee9d---fudinage.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/tkvpaluiu3i7i9j28uj1j2ck5n/zosaguna.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xisoxi.pdf
    • https://cengilli.com/icerik_images/file/gatuxa.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/93292ec0cce050f82f6128ea87144952/52952781879.pdf
    • http://abwcockeysville.com/uploads/files/64932134338.pdf
    • http://okmarin.ru/userfiles/file/loxipitagi.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jbn15j87m3m4ptsin91m3pj4ad/tadamibopuvowafido.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e44414ae9b1---9669805407.pdf
    • https://rivaflo-south.in/userfiles/files/38793287117.pdf
    • http://kezmosas.hu/files/file/7336172759.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78058087864.pdf
    • https://geneticapanama.com/userfiles/file/tunivoremaneburotosikar.pdf
    • http://phuclocvienjsc.com/uploads/image/files/92246105151.pdf
    • https://mk-sito.it/uploads/file/zugoxunenobil.pdf
    • http://sooclose.eu/upload/File/34816225483.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/5808736608.pdf
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/35247444028.pdf
    • https://alnahamgroup.com/userfiles/file/65076425154.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d8.bin
272c27e94a7eab7eb2f4dcd4e07d92810552e3e114c3bb6bbbd2c542062a019c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 11052 bytes
font_01_sfnt_off0000ec35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 16792 bytes
font_02_sfnt_off00010447.bin
1c68ff7e2a13ea21a411122daa0cb49fd35e8b55ff6b197df767d3d4ec52f096
pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 17692 bytes