Malicious PDF — malware analysis report

Static analysis result for SHA-256 f640a358a45b96be…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 22:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ba11550fa9eb3f3a850b734d20925389 SHA-1: 01da283f4ba052d4c14d53cae719f653d917ca32 SHA-256: f640a358a45b96be9f70668a4b8db1db4ad1b7ee0ab08f9d0db5d4df9d7a42cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of multiple unknown URLs and a high ML classifier score indicate malicious intent. While no scripts were directly extracted, the structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008821d6d3d---binolunoperibozereji.pdf In PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/gukawud.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/91510140533.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/39318956382.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b551c8d9b64---fenumozamoderejif.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39283a4dc8---donodazi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/58223660614.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/98990163143.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/mifejidadeweme.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347e09ec982---12938887065.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16089697d03aed---40471283071.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af8bae9ea84---97951583072.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b35e485af9dbd77acf255c87925c8d6e/gumidirodatome.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fdh3cb5u3pdlv008e0q4f0762n/jigupofuruwa.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161263eaacb214---53275554952.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4mq2pkl529itok47u0m1d5enpv/mutipik.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160702e36d34c6---54574493266.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161235e9d7a151---44994788660.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/40498544123.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/27629299228.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b604f19a35c---32452571054.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/12151315322.pdfIn PDF document text
    • https://maturana.cl/upload/file/bidumojuzonek.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/zisoxekonun.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba32bdedd---wopev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=milwaukee+voltage+detector+2202-20+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://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_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 17496 bytes
SHA-256: a5f87fab3791c0101103d930eb737cb4e6c1f92ac225e70b0f406bcb933b0b63
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 11160 bytes
SHA-256: 44f51414f1c265eb200924dc8bccd5bb60772f37f278b72ad7c8469bceabb3c2