Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf7a0c894b25fe0…

MALICIOUS

PDF

111.9 KB Created: 2021-07-01 00:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 871c3f2d7ce6d8ff72512beb7e97f291 SHA-1: 121de20b97beda5000d17f4ee5f1929865d1b86d SHA-256: fdf7a0c894b25fe0fd67bb41b0e398ffc583b6543a204937695028ce324ef5e5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS uploads. These links are likely used for phishing or to distribute further malware, aligning with spearphishing attachment and malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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 http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865894898fb---narabadevigikezivowodav.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/dc23c13ad0c58b651b3b52190e867840/46121064371.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa087c13d4---gulofubakodokiguxamufunur.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857a186a8d4---robitevigidabiv.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ludelefedub.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ee161266---75008634810.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a099e52---ramivedajakorujepor.pdf
    • http://hotstamping.pl/files/file/fojesagozotusewawujeteje.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1633af6a---ripukozunivavog.pdf
    • http://www.blueoak.fr/image/file/6758000323.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c9c0ad1b---kosoviwijumazal.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/26938008982.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/126d50ed861298225270ea7505909ab2/dezelopipedufukalix.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/43738b748b84dac08d09d63354e85713/52155014052.pdf
    • http://studiogiovannone.com/userfiles/files/tikigiwudatidozotuna.pdf
    • http://e-district.org/userfiles/file/10788138846.pdf
    • http://auchli-appenzeller.ch/userfiles/files/zexajekuvibus.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e946415fb---pagekawofokulimoluxo.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a93cc9c9b---20521925437.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160914c902cbf6---97894910007.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/lobipidaxurenonajikix.pdf
    • http://a-swiss.com/upload/userfiles/file/bazebew.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/26781232525.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160713ed49fa57---17078816826.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/phe7bf4trd57gr2a02i7vj3h96/55012834097.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/jei66tcl7mp1s67ot1utljgo49/dibikurata.pdf
    • http://abpaluso.com/upload/file/rabog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=proverb+beseeching+patience
    • 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_off00014fc0.bin
7b289c98c9222dc4d423bbea0817a09504e7ee875f4bfb306bb0395a6b87f906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC0 18344 bytes
font_01_sfnt_off00017fcc.bin
455649269d8a9c03bafb05677549849b3277dcb04905f27b073122f5682023ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FCC 10812 bytes
font_02_sfnt_off0001988b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1988B 16792 bytes

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