Malicious PDF — malware analysis report

Static analysis result for SHA-256 6668d2984d46f18d…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 22:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1556133f83d48e65cca22b4ec1971f20 SHA-1: b7aedaf66f8017c90dcf23985a702c77458432ec SHA-256: 6668d2984d46f18de7193eb58b3d891accd77ff4ed7e1f3ae9fcc884004687ab
66 Risk Score

Malware Insights

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

The PDF document contains a large number of links to external PDF files, many hosted on compromised WordPress sites. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.2406

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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc0e1aa59c---vovozuf.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/51d8b2e0947f8991a57c167932b2ea8c/niromija.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/vobeditatejalo.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/29474158510.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/g8pafereqr1cob5jrvk8hf46tq/10564415284.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/88151f4b7d1f5d03a23690feca139e66/vojipiboregajazaxaxe.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee45649a6b---32987507102.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbeed71dab---22384183021.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6bc00a975833d8f9714cb45a336fb94e/77680105173.pdfIn PDF document text
    • http://artospace.com/pics/file/zewiluxogawitulavidafate.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/tijililosijimiva.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a21a0b06402---56595859326.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb0b1cfa3---81627052054.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/g8vf7d0dj3b31jqi1qfarri2nl/93725450295.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/dafodorosupibukavatatafom.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061412122073499.pdfIn PDF document text
    • http://esistore.be/userfiles/file/donoredejukilesutibig.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vetamuzijarurow.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/9snk4s4d48039pt3b8oaakgok0/motixufevuro.pdfIn PDF document text
    • http://byecook.com/ckupload/files/83186652288.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/pefito.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d40297e01d4d415b854132ec36e27732/gurodetubojoxinama.pdfIn PDF document text
    • https://primer-spb.ru/files/files/72939233479.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b645f54b3d---werunuk.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d96ce02dd---4310102500.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ae6a05917---93456146518.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/c1k73fpb5kfl8eusae6r02pp39/wodovorejajoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=refugee+blues+questions+and+answers+class+8PDF link annotation
    • 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_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 11376 bytes
SHA-256: 0030fd4f5cfb1e156016856126e3948553050c18784dc3722d0e8392bef26354
font_02_sfnt_off00012c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C95 16936 bytes
SHA-256: 2a6a72380a770add57d21f3846f262a42dc0182a5e68f7f072a9509dadf9d46c