Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eff176ea3b19e0…

MALICIOUS

PDF

90.9 KB Created: 2021-07-13 23:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3eda39310f872a7d6ae368b78ebf2de SHA-1: 5bd5e74091ade7b206281bffce03f6fdb2bacf9c SHA-256: d1eff176ea3b19e00e426bb6d18295a013b7f204b67ae03d73c4f974c849b16c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised or disposable. The primary goal is likely to lure users to these sites for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xn--nmqu14inmf.com/upload/files/veburoxof.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/opf00k154khp510l18ef2uafse/9233991628.pdf
    • https://icbacademy.com/upload/files/jivuwojozo.pdf
    • http://mwflower.com/upimagesfile///megedabetejojeli.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0227391a483fdc3c2467673ef11ce4d9/10064755728.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/193e647ee902bd36c895dc3d47564672/68965765016.pdf
    • http://softwarefactory.nl/images/file/puxidubi.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcfa72f5e---27223510963.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bff11b54b4f---derujeberajejebujoruko.pdf
    • http://magicdiscoradio.hu/userfiles/file/5863472432.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fumokivobu.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a98cd2cd771092435527df8e7a1240e8/buzupiborajiwodokeb.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f6ea66ee6e3571061b3cc3d9f4159753/gowofutuwukoxiw.pdf
    • http://sakuragiramenandsushi.com/uploads/files/19877738712.pdf
    • http://ahkjt.com/upfile/file/gojewujutoxivaje.pdf
    • http://ipublicity.cz/data/file/19894787315.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/80d72054e9991133e2646d6dde9b7e30/55727608018.pdf
    • http://www.yoko-ono.be/images/userfiles/file/lomerirun.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad9e18c72---4326534899.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160785b3fc5f3d---39704731334.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26223644b---narimebovoxujagudulebili.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a9896d105d7---47022055538.pdf
    • https://elnativocoffee.com/silver/upload/files/radetexijivuk.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42061242a---lubapob.pdf
    • https://wipaphun.com/UserFiles/File/26442684270.pdf
    • http://zwickerfoto.hu/_user/file/23339156535.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=appraisal+system+examples
    • 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_off000102ea.bin
c7859d33aefe94caf2eb5ed390d51bfff021879cae77d173ae8885f7d9855277
pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 16732 bytes
font_01_sfnt_off00012e7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 16792 bytes
font_02_sfnt_off00014693.bin
0f243eb967f2be8583f2e16d6b5393996291a2412157b68646fc56cc0235ecc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14693 10388 bytes