Malicious PDF — malware analysis report

Static analysis result for SHA-256 821b25c249de57fc…

MALICIOUS

PDF

87.8 KB Created: 2021-06-09 10:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bccd479a125f210e6c37afb068285ca SHA-1: 83084931cada591a2eb17072d5573a85213423de SHA-256: 821b25c249de57fc3f1320659fd434d2a2fd738eb21a4c2585b0eda253e1074b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to specific PDF content, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=seerat+un+nabi+in+english+pdf+vol+1
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608045fccef09---lemosinuvetid.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6f0828f8---fuxuwozotatilerakovijugu.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/iqnbm0s4u0eqkvmh966700btcr/ligepagegazupuja.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094045c3dcc6---42535212951.pdf
    • https://baxsporthorses.com/userfiles/file/vetadufenoliwege.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8034238928c7f284034228478421b85f/vokiwofibanidazibek.pdf
    • https://htddienstverlening.nl/userfiles/file/19152952030.pdf
    • http://kulturazebrak.cz/userfiles/59115914563.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6b5d78e4f---74634514732.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/dupurufuvenuwadozodal.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/eb2f7f03cae35cd0b8f158d1f91bfe24/motuselubogezunobinur.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/96a9a84c94392a37115d25dc0f9dcadb/73696796079.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/19b1129c88336d5fe88194c03d1e3fee/20679625689.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/71b7829393365cadd3b71f75f9b87f87/54567506112.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a72b44fd05---23644870314.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f315.bin
ecd32ef5e1745f2ac0411ed29156f301d5933207582bd5728b525d9ae2500a25
pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 5540 bytes
font_01_sfnt_off000105e0.bin
6e339a71d2b67557ee7ddb7e734a6dce103e68a7faab20c9bc759d46d7ef8ca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 12972 bytes
font_02_sfnt_off00012edb.bin
b59774e6397700bdc37bc616d1bc34875f8417d474f9afb46dcc51eeccaa1905
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDB 16164 bytes
font_03_sfnt_off000143f8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 4324 bytes