Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5ccd22bc842fe7…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 23:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54fa5446bbf8f291e9d607b963b8360a SHA-1: 46310e67c6f2f62efd981b9ceab742ac0183ee0b SHA-256: 8e5ccd22bc842fe71eefba749a7f16bdeb1d7ea104445fa6eab3af41b6fe3049
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous compromised CMS uploads, suggesting it's used to distribute further malicious content or phish users. The presence of many unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ge7ul6ubam1i55e5vcobf0th83/vitilupamuferebagaleg.pdf
    • https://kodcomputers.ro/2664/uploads/mupoza.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868542d4575---tofirapawapaxodosebeduw.pdf
    • https://topclassgreenery.nl/images/file/6192589094.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ba9dedf3f2bdc21c27b83a2a47b0aa0f/82597998425.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4835524e2---podusutizorawodaku.pdf
    • http://zabradli-znerezu.cz/userfiles/file/3249765474.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e495b9b66---xamiditaduj.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a36ab92c8abf1913177649e9d8e2c558/34951356193.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/refexuzezimu.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/eebc0355c6e116a99dee35ab9841306c/mebolaforewabozanonokujaw.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0eb3a203c---lodakifufawuki.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805f083b9e2---6237146960.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ffa87c2d4a90f42262dd82abcf0f112d/13499792686.pdf
    • http://obasekiestates.com/UserFiles/file/69330903840.pdf
    • http://bigandtallking.com/userfiles/file/weredefowepojitukozibag.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a5d5c684---fewom.pdf
    • http://sochisushi.nl/survey/userfiles/files/koxunesosogadiv.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7851258f00---fimafigepolowerovupix.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fogafifedite.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/603412ac8bb4f5c24d838c16e4d52fd1/jonemaj.pdf
    • http://yossy.biz/userfiles/file/sekobiwizik.pdf
    • http://ytbozhuo.com/upload/file/231449491972.pdf
    • http://tipsclubcr.com/campannas/file/sizuva.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947277806e---vagimipuviri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=semiconductor+textbook+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_off0000ee16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16792 bytes
font_01_sfnt_off00010628.bin
f345fbce3006e5e0e5eb3150b27b532e819a70cd1f608c93f0444efa6fb8ae3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 17412 bytes
font_02_sfnt_off000133ed.bin
166d5f3129139bf09cf3dbb9d6ae594fb6ea67504ef2654fc3b1ffc85d20b412
pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 10916 bytes