Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ca70606a487c6b…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 15:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b083ad266f2c8ba280e89c571ea0c88d SHA-1: 0a78a8dccbc597fb9f3460f8640a979ad0a78396 SHA-256: b1ca70606a487c6b6425751ef527418b31679f224addb86fe44eaa7c0b5f6d3a
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to manipulate search engine rankings or distribute further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://granite1962.com/clients/869125/File/pelusapituzojurapilobosa.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/52f03df78f27d5b4deda21350a24b960/bisafaxowotajepivemibakap.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/332e8886a38c8fd4c8b2b73c49d9cdc3/37165588309.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e5b46c3e5---morutumas.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18dec9071b---30872954722.pdf
    • http://studiotecnicoprato.eu/userfiles/files/35027895485.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/67178955562.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfe180f99---mazimeriginesu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ff449ceed---runalidijalu.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a01b8a0d---rogadodonebotevexidumo.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/o7maqpa8bpjs4t9gs85sg7b766/mozawedodube.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/makt9odmombuqpauleai80gtgb/ritafofujusotote.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073781da3552---83594577226.pdf
    • http://marcelponjee.nl/ponjeefiles/file/34388661039.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ec8a68e3---gijobumafenemonij.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8659c34ad7---zekujanu.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/1fte9bro7uk9rofmhiubmobhh2/supefanafojodi.pdf
    • http://travellightnepal.com/userfiles/file/gifikomogebu.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f359c3ec9---41335130218.pdf
    • http://tai-group.com/upload/files/7276230446.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb885ea98ef---18822487819.pdf
    • http://www.polni.si/Images/files/zemovokof.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff61b72a2d---sotaxitama.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=evang+nnamdi+ewenighi+praise+and+worship+the+lord
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d06b.bin
23694a27be3bdb3eebf566a7da28513a57c0169fd12b36cdc6a981e51f458386
pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 10972 bytes
font_01_sfnt_off0000e97b.bin
1697776080bf7a72fa6dabed3cf4a069b949d77f6d046f49d4adb87af4675d52
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 17000 bytes
font_02_sfnt_off000115ad.bin
6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16384 bytes
font_03_sfnt_off00012bf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 16792 bytes