Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf433a80ec08af2…

MALICIOUS

PDF

98.1 KB Created: 2021-05-04 08:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 07f5cfdfe003ba32a710fda7f4051bd2 SHA-1: e7d8fe62bb7add669b595806b042a01e7927ea5b SHA-256: 7cf433a80ec08af2672eda2ff56266c098783348071053a83d53ba0628bdd7aa
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to compromised WordPress sites, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is not to convey information but to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085a279a611c---75227880034.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081d639b8dbf---70503764348.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c0b6e4faa5488854aaecdf473e2da9f4/58087103902.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081783d58839---bedelifajovokojuvar.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d2a77276f7---86762623591.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608de31e93256---lijoginapiwe.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1pd66t66i11i7mrf42s596fca6/70207268670.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4ae1700ac79199450069b4bbeebb6dc5/pazagaxepos.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e3992c55f3b1b6269c7506021e726f77/niwirulibulatanoviw.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2c2aef17---56973919604.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/32403248961.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eae0218ea---vubipib.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5e529b58---runazama.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b9ee1988---98138007803.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f2e19105---sabofomi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4ie8qehmotc21hv8ktcctm67q7/66836188245.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/vozikepipilanas.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9a242b66---damewirisusoroguwo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084acf703e1d---podososope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=breville+coffee+grinder+instruction+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 5332 bytes
SHA-256: ae9b94f513e1be020b1b65eea24c5324c11dcaeed5acb79139542d4722441e3d
font_01_sfnt_off000143f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F9 11724 bytes
SHA-256: 88bf3b3d9e2433dd1a6af1a282c8ac356f9f6cf1898f364c198922112ff15c1a
font_02_sfnt_off00016b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B26 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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