Malicious PDF — malware analysis report

Static analysis result for SHA-256 615270f89773bb56…

MALICIOUS

PDF

91.7 KB Created: 2021-06-27 04:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dec98b35a2d3189abe1c717fa8c998f SHA-1: 52ca0164f0322a6a4ed59120dd070ef52cebc8a9 SHA-256: 615270f89773bb56a8150906809cd55f6da8db347b1e22692a8615c140e016f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The embedded URLs are hosted on various domains, many of which appear to be compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ad890dfe2a5b4e4f84e3361212fc553/dizumokomukolis.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jemopovowapasafonezipoza.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/g8nhupvd8lsnc2v0aa1iq5ki42/89813818094.pdf
    • http://gdaniec.com/upload/files/rirojatesokoma.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bec5284a34f---nubazadak.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb3f5bbcc---51768187292.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zarukabalogesowegel.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a359809b939---24348149720.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58b0743a8---44079003588.pdf
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/toxowexozikoromerew.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70c3671d8d---10170910515.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1f8fa3f05e64021962f724af1a87a149/xikuwesaderiwu.pdf
    • http://hzjksj.com/images/upload/File/fizutevazijoveduma.pdf
    • https://peilimineko.com/userfiles/file/xasofaligojufurusoboki.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/m11uvgh5714l9cer7s38aochgf/1053583418.pdf
    • https://biocoils.com/img/file/tisedorolitawetutonawiwo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c985d7f94b53239d0671bc565d7726d5/69535988227.pdf
    • https://ikuseikyokai.jp/ckmedia//files/fapapipitafalefanufimela.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/540c40e414df651ae80d96397d3f9c46/90769472153.pdf
    • http://aep-tc.com/cache/fck_files/file/lemapenazinumelefu.pdf
    • https://vijyaiprismcrm.com/userfiles/files/27900468662.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff869c7eb---jafudad.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/lm38d3u7ekb8c9r347f3gqdef1/kuwevejepi.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32bbad1d4---2211118851.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2014+mustang+shelby+gt500
    • 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_off0001014e.bin
d2abbfb8d53bf5af1dce3b180637bd91ccb77be534817f2c4a94b82c8c8b5185
pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 11004 bytes
font_01_sfnt_off00011ae3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 16792 bytes
font_02_sfnt_off000132f5.bin
35680264c0a8cfbb9d27b035226b925d488363dcfe8d9d5eb1bc2e8750e4123f
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 17996 bytes