Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7da40646dca5135…

MALICIOUS

PDF

91.1 KB Created: 2021-06-26 00:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bc4c06fe268e91ab048fe6e42c056091 SHA-1: 8cc3283feb0b2b2fea8da3604fafd290736388d8 SHA-256: d7da40646dca513573959f9e36c42a59bfb89df92ac82f07d5d1dada5fb32693
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the structure of the PDF with multiple external links aligns with common distribution tactics. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089c7911ca40---kovogebitowiboxixe.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae820d8b0b---zepakupajoromuwamuluv.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ff21475b---50236704677.pdfIn PDF document text
    • http://erex.hu/upload/file/dapilotebazebewola.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lmbnjum4akbn9m75g1slp3ual4/podefajuje.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1ee3c1b6---xalixise.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/21e580f3d3ea3b5c535814a2c0db3eb3/bebulitomeseralo.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b307d71ed62---firefexasenosetumuvufel.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c5f4e6f99552c53e4968d3587b46480f/54837564681.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d529c0a6bf8---silepivupevedaj.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/lotujetag.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lgssd6ihnql080ffu6jcved874/21585453602.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba431d2468f---37490935374.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e411e3c837---6771591650.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/6889205181.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ad7141e13---22414216839.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/85970715713.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/61925058798.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/373c5050d720241c64e5156435cdd68f/93037792540.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/fda8a51f11b857bd2a5e7e5de0dd69db/81019644948.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2fcm1bpotv7n5opvo80kapol2t/xateguvu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rtd8rbfhvvsvpsic8hv47e62q2/zetobalidopadikibegoniwo.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/gogoriwofapozuxi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/67b41c8674f3374a4740fb0ccc0443bc/93624531286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=no+salutation+in+emailPDF 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_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10244 bytes
SHA-256: 1988c85c5d6728c004ef1292388d226f744367bb6db696f71fe4562ceb7deaaa
font_01_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 17932 bytes
SHA-256: d320f2ecfcb03ec2c0063af4dd2ee01f5714698c87a62c5d1a7bbdd6cdcae3e3
font_02_sfnt_off00014719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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