Malicious PDF — malware analysis report

Static analysis result for SHA-256 530d2c972162eeb8…

MALICIOUS

PDF

131.5 KB Created: 2021-09-03 23:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3cf67302ba21b12c8d15ecddc375da6 SHA-1: 72eefdb946d9c903fca0f980aea62f6bf85e2f45 SHA-256: 530d2c972162eeb830c5081127229364826b982edce2a0cac285869aca98bd22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=2016+chevy+traverse+owners+manual+pdf PDF link annotation
    • http://serting.eu/userfiles/files/72254921707.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59c716752---fosibiwakezi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a932336958b---zozuxekedituvisavoligubek.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a155f15033b---nanokamumukulajokusolok.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd345878a6c---60753684057.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c3cbc21d94e4654d583954ff7dbc8555/ximufimusivenusibiwutav.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2af6a548---situbokumumolibijenegone.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/fixaxogerunetij.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216281257231078.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/15021261319.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612003496f6dd---luvipejadumoxuwutixulit.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/goredoli.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/91475262861.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/77718137099.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608544a3afc6c---46099291868.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/52583009960.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/124426723eea42c8893c421800a1f7fd/zilezelesulumituvosexovor.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a876520d2ad---55092330895.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/22292505522.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/46986479524.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092edb9abb3a---47355742451.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xesiroramubadukedexakopu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19553 11524 bytes
SHA-256: a79356ff644d057f6643d6545e21f603bc300f24315ae4921045a0c279808e4b
font_01_sfnt_off0001b0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0A0 21592 bytes
SHA-256: 52f4a7e208bbbb90580a6fbd0c6fe00ad63f0b98cfc73d41a114207755c8d065
font_02_sfnt_off0001e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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