Malicious PDF — malware analysis report

Static analysis result for SHA-256 b472c66953e9ecdf…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 11:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40359cba611247d2d9a5d0eee46ae732 SHA-1: 657cb5cd2c2eda727ec5aa563933156f6e4571e8 SHA-256: b472c66953e9ecdf2bd3ba798f17dec0201b345304d26525be66cf9546bd3fa1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hepiran.com/cache/fck_files/file/rilosunotenukakusu.pdf
    • http://gift-founder.com/archive/upload/files/47543134505.pdf
    • http://firewheels.pe/userfiles/file/wigolukokogexugisirejilil.pdf
    • http://arucax.am/user_images/file/zukabewawerutunega.pdf
    • http://harlit.com/ckfinder/userfiles/files/20210911_162538.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbdd49f59---libawabisixame.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/501a8b64f271dfde76779c498dc0d9e0/pagopujelako.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/79710872147.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc1fc4183---80838039155.pdf
    • https://superchills.com/userfiles/file/52415563266.pdf
    • http://chaukitchen.com/uploads/files/vojagagedegapu.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/rukenox.pdf
    • http://ciaomamma.hu/editor_up/lonozexekovapiza.pdf
    • https://100tmt.com/uploadimage/files/20210904055016.pdf
    • http://fotosvatba.net/userfiles/file/67372750676.pdf
    • http://stattus.com/assets/file/favusumumuposijuli.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/93952870475.pdf
    • http://gartenbaukoeln.de/uploads/files/11079074278.pdf
    • http://sinostandards.net/upload/files/83098635598.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/gorebe.pdf
    • http://divapharma.com/uploaded/file/xotepirisi.pdf
    • http://ombs.ru/uploads/files/58907266694.pdf
    • http://thaymanhinhlaptop.com/userfiles/file/56895523134.pdf
    • http://sky1981.com/asset/uploads/files/tumowunixezowakoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=battlefield+3+max+players
    • 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_off0000d469.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 16792 bytes
font_01_sfnt_off0000ec80.bin
f56b1a411c808f438cc9ac7e21c5aee667acb1c8a8f34c3e50f7609584f39c36
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 10876 bytes
font_02_sfnt_off000105b4.bin
3298463385bf42a868727f5fc52ae6e5c093be6fa11f560646ef44640418e7d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 18272 bytes