Malicious PDF — malware analysis report

Static analysis result for SHA-256 c725a27daa40c32d…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 19:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5de6afdc5c960ccefccdccbc37f1e5a5 SHA-1: 9596d0d7985189aaddd4d292d63acc39ca42332a SHA-256: c725a27daa40c32d0a752fd887694f2d070c9d3ed7e1fdb3d729cc7019b6a6ca
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress installations and disposable domains, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The file's structure and URL patterns suggest it is designed to lure users to malicious sites, likely as a first stage in a broader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://cructi.ru/uplcv?utm_term=givens+black+mouth+cur
    • https://anpheatingandac.com/nbloom/fckuploads/file/96014482414.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/g2do2e2de0457qu6p70bt7v7sc/23233688158.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e554c6059d---48748814767.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5388a144---tinamuvowutuvox.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/48e85d960d7b0cef66dc9ccbcfea5929/zamuxusefizediziz.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/010da25ab0b00f068a4b5ef085f7cda1/66995027154.pdf
    • https://bettyloupaints.com/userfiles/files/81431246353.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vge9mv47km52trb43vahh7hdb7/siwar.pdf
    • http://allycatering.com/userfiles/30784417601.pdf
    • http://pcwenhua.com/uploadimg/file/1623871040793778450.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c422f02a7ab5e8778e0ca8ee8082940d/seput.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bcd0cbd00---noxopobewovaborixisu.pdf
    • http://skybuildinfraprojects.com/uploads/94368015548.pdf
    • http://cloverpark1959.com/clients/51168/File/72517143904.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ffb373f50ffc11e67d10b23b2aefd1e6/68832083560.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03977bc53f---94360695844.pdf
    • https://airflow-skateboards.com/upload/file/tixadop.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae305a76e---55049347741.pdf
    • http://flatadministration.com/uploades/fckeditorfile/mubeja.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/escnhtprot1f59aui8lbn4j76d/vukenulopumetegogon.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d7132190cb998cde4cb255f66571b79f/92290563623.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 16792 bytes
font_01_sfnt_off00010327.bin
a3d7ca45aba85f153c9288a41328e4970a49ff2a60ffa2f3511359f75d91dcee
pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 17132 bytes
font_02_sfnt_off00012ff9.bin
5eb87dc3a735334116559d1e6b9e50dae6b84581a1973cef5fb437ed418aac33
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 10932 bytes