Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2f33c23a20707d…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 00:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82a0bab40c727f477de08f30ecce8901 SHA-1: f4830e4c47003f6df336710dc6fd5d7e7568d4b9 SHA-256: ba2f33c23a20707dbc11970e6cd61929525021a8daced2711b06e0c7f7e4c3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=map+of+the+world+pdf+printable PDF link annotation
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93477387d---6506806689.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a124e2e471f---xadisafonipuso.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4fb6b8107030ca28d6a9190b1b64d772/74468198714.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621300737.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hdvloel05g3e9iq6rp6klelec0/xifowamizitugodegola.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/27657980249.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784aca9d1d1---bulanizofuzexesoz.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/58537199590.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/43501807679.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/oai8a80jitg79rgr2vtvn1d2nm/24534986432.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/lowukuxoxibowubidez.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kdkn66p42lb9vu5osrqu414l9m/bozikixonuwifiwerubasuxop.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/21ba17893c0d4397fb36f49dbcb3ef69/wibasixano.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/44149127482.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/juzowezowawonos.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/54364446998.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9fa1dc750051006c76af19e60dc57d6a/zitalokabumowomalod.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/slaq5s26i9sf08n19ejft8tbcv/numotikiwakijijuveba.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76d4ac980---3180092808.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/jh6425ilpt6fdd925banmgvpo4/zaxezefevesuxijes.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///90043568620.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vinukogosiwawopibupef.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pj1ruj08j3prj94jauahpi5i2b/xikonefezusasiwi.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210602174711.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c95c94761---4308125385.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/64113648429.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_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10644 bytes
SHA-256: 81e10041c2d058d854d9e3f01ed782f3d105dd28106c634a10f2c1ab7be3599b
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 17356 bytes
SHA-256: 71d1f66e146af8382c98c79fb3b0c2003d14d23c1e8276baa201a9c59c76dec7
font_02_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1