Malicious PDF — malware analysis report

Static analysis result for SHA-256 3067a366f9df6501…

MALICIOUS

PDF

82.0 KB Created: 2021-07-18 03:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f1f40a145f2eb943ba835ac6e73b2c1 SHA-1: 10126bbd86b0a51a76af5065e868dd821d5ebe01 SHA-256: 3067a366f9df650192b1d4a0b929d979fca20b16d785d6f752e624e95618eb72
96 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of these links indicates an attempt to lure users to external, potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56f06ce92---fanomewuramokifafawumozu.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d6d8f0ad59f5a214955c829128809942/sovujolisojobiretim.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160918957d7227---bebifepetidufimofawe.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/nalivitezosivixideve.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160866b9e55bfb---podojazopedagovijevujo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2fe0265c6e---logegupopowem.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3kmts7mp9n3kgghjgefk9v5kd6/75959665518.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608945962cab6---lazogupi.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f121845ff---59116757104.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0095141c71f397543ef2090373e6da1b/88114777121.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a6d8bbb4---rakesunanupibupipitizos.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/94968692804.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3cd5b197d2bdd2bdd4d3c2f4fa8dff97/98855011776.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fcac416a53e849485d3764f03c91c507/83301522092.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91eca95ef---webaleribukovozexi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/n6bctoids12o6l9qt926qkq1he/misemonutuzuvojutifiga.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/fems85ma1m3cq5bovl02l66iuq/52884168310.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/545b018b71bf9215500abb6e2d6f42fa/82853700007.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/10445038802.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c1ecb2fe6---gidagi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/5c1c4e741d5b47c2612876c11b912f28/vuvoluf.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tlkuct5vcmt70980fn9qj989de/79647363177.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/6274696856.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/miralav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=this+issue+has+been+resolvedPDF 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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 10516 bytes
SHA-256: c30becab0eb84fced9eeb4949a8ee1b4aab50beb592486d0d81a6786625980b4
font_01_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 16740 bytes
SHA-256: 5e13450cb43f74590670810bedb682daa75588939d66ff06c41dd2aa275d3ad9
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1