Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bed49c19f0953a…

MALICIOUS

PDF

84.7 KB Created: 2021-07-07 03:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 299e6d37cfc68f7667a5cc0961f51d42 SHA-1: eeab7d6b78700ded472b0f192159eee8fa7dcc6e SHA-256: 87bed49c19f0953a0b18aa9fa004247d7bb22db0b75a11f200a40aa92d653bdc
156 Risk Score

Malware Insights

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

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 compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462b5adde1---80596588103.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/finegobeliwabenebivenevo.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/72ac40924d01967f28e6e3f4ed04ab3c/jatamuso.pdf
    • https://mimpishio1bet.net/contents//files/beloziwedew.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a93a16917ce7e5073f91f5527a8897b9/9812125291.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/45201831594.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/st8t8lcq94no9tbqf9rcetishf/90573214008.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/18127570925.pdf
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/69690673672.pdf
    • http://elsekmont.eu/userfiles/file/senuwokovonavusineri.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b3d78eb0---kuvekafamerexevoga.pdf
    • https://cortopolis.ar/userfiles/file/witos.pdf
    • https://sinhadventure.com/uploads/file/muvafom.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8dbe8ab68e8a0f156d112ecb2121169c/54338073620.pdf
    • http://qzgj.cn/upload/file/12274957351.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cd7141071b3de109c9b0e10432aef5dd/77197746793.pdf
    • http://preserveproperties.com/userfiles/files/jigenip.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/08e43aefd0ae060a2ea361f8f59aada7/wakedodojiberawuvatubudak.pdf
    • https://rajaunited.com/contents//files/fuwalu.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/sakebifomukujirezijimodi.pdf
    • http://aeronautike.com/userfiles/file/xudowebisaresazipuda.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2f53fcde2c74eb629095ae109d429311/nadukunug.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0471156ccdfc492c07dc3a0780ca1693/60720720134.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c200eebf5946e0a09f2e44674d080d9d/75955055092.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160982c0ab048c---1130263340.pdf
    • http://arci-mp.fr/admin/File/23762368392.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+spanish+guitar+by+toni+braxton
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c676.bin
1857697d08a910c5ee1cc2bccde3940585cec206b640dc30f28e2f766323e51d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC676 18332 bytes
font_01_sfnt_off0000e364.bin
3f3848d077b95913659bbed70e318b1780058e8bb232cc362e21945bd38efea2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 11084 bytes
font_02_sfnt_off0000fcc7.bin
d364ede6174a1905eb60a4957febf41153ab7d45e62f109cb47992dc274d2f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 17428 bytes
font_03_sfnt_off00012a9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 16792 bytes