Malicious PDF — malware analysis report

Static analysis result for SHA-256 86911016ba0d81b0…

MALICIOUS

PDF

105.0 KB Created: 2021-07-01 00:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5081d5ad5011bcf83cfacc9980a67434 SHA-1: 2530d455fb43b98b448386bbe5eaed2124173db8 SHA-256: 86911016ba0d81b02d69af152843b7fa77105c17f86ed6bac383a8a0b04c16e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to host and distribute malicious files. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/03008a19aaad50f6ffd13c537c8e4a98/marazesujenoguxigi.pdf
    • https://residenciasanamaro.es/userfiles/files/76406173667.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42297075a4---33025849759.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075367f1c31f---5922181670.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6e2715fb2d07f6fad16d445c72db2463/dililasirevapoguxa.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607758c190bf0---44461999227.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758c5fb8a35---69449878015.pdf
    • http://knshzj.com/CKEdit/upload/files/99512446406.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867fa5abfc---vitidisara.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895b35d4cf7---dawovodixogolef.pdf
    • https://alarrabnews.com/images/content/content/file/lidove.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5afmr3edt6irtc4j85dvtdf226/dapibunijufavivufuzoluf.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ejn9cp7hj16tjv7qgm9j2klj93/12478786210.pdf
    • https://actor-conseil.com/files/file/tavadetopajesonidubakesom.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328d260230---9462711718.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6a820377---33141079019.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ce175e6c---xomoxif.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16076cdfbd98fe---72244351842.pdf
    • http://bestpokeya.com/uploads/files/duzub.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6eab74de---12643610242.pdf
    • http://szentdorottyapatika.hu/files/89060207652.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1f9547c591aa1f0c67f9d8a1fb623788/98791394925.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608abf7f243a7---60289945973.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/ferolori.pdf
    • http://sjhrz.com/images/upload/File/18929759715.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=types+of+dipole
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119dd.bin
090c5c43f6647badee21bf69c9657bfad51764f19508501c18a2b391e29e1858
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 10104 bytes
font_01_sfnt_off0001307c.bin
95c8a9dbd1dd49669abf6fa806013c85d8018dc1db0da3b2c0456e226a110645
pdf-font-stream PDF embedded font (sfnt) at offset 0x1307C 21040 bytes
font_02_sfnt_off000168ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x168EF 16792 bytes
font_03_sfnt_off00018100.bin
505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x18100 16100 bytes