Malicious PDF — malware analysis report

Static analysis result for SHA-256 74155c07ff051404…

MALICIOUS

PDF

98.6 KB Created: 2021-06-26 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 849d60cda51fa1003255e77d888b8262 SHA-1: 64df0f528d543a82adeca173f9482c0d10b98fd0 SHA-256: 74155c07ff051404187aca7b87050aea2b44e748a34a9e30df24baf907d03394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The primary function appears to be redirecting users to other malicious PDF files hosted on compromised sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/86de1115818b47cbbd70ff1ec32d37a5/tosedisipedagosuwiva.pdf In PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/toxokozumizowawaze.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e910d36ec0d0d77f43bbb07aa49f7f28/93868757227.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b48a26f25---23672655536.pdfIn PDF document text
    • http://skncn.com/u/files/mifegatefasexulepigad.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bac2f18df82---51540240071.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d028a74637---wajopavir.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609215f271470---demilipigiba.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/59b809ad31b85ac55b77479072a79349/48584902161.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de49e70c1---renimorotafex.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/felulovubikupuwuwazoja.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2dcf593b28---musogoj.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b66cd346812---3174479819.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/87537393696.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bb9b067eb9e18830a7931a69d660e658/wekulajisiduwuwiwut.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9864d7e572---56029264490.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/507faa7234a2a0c8fb6afa00d1aeee48/jafanimajana.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/82797906487.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e27336cbc---nuwotowoduvesuti.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ad208185b---fafivejaj.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/aad7901ae1573bad618cd78f4d7f63b4/39632438240.pdfIn PDF document text
    • https://bataretak.com/img/files/file/texixenazejorupakikamog.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/n5jkqmgjcnr9g4ljnbta0gic8h/zinek.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/3f1930dc56c599960778bb4a8fcb6eba/78910966165.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827c301a81e---3748201159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=in+order+to+increase+the+magnifying+power+of+a+compound+microscopePDF link annotation
    • 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_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13493 17384 bytes
SHA-256: 3b8ffec2c78db3b4eec12d7efe858ab798cdf2d7d1eed8736a880cf24cf29e68
font_02_sfnt_off00016247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16247 11272 bytes
SHA-256: 817b1f140f52068c52d4b1117f87fd3118ac94a6381651821c14d80f93b76d83