Malicious PDF — malware analysis report

Static analysis result for SHA-256 a559bbf6ccbf3d4d…

MALICIOUS

PDF

81.7 KB Created: 2021-06-26 06:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ab2d9f5cc97e47108f024226a8b5e00 SHA-1: 85eff9b06edd2928f643bfe1b7c9fcbdaedd5bfe SHA-256: a559bbf6ccbf3d4d1024a11e2df11868cda88eb1e5d56c2010d96b6c2f43d788
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains multiple URIs pointing to external resources, including one using a raw IP address, suggesting it's part of a phishing or malware distribution scheme. The presence of numerous links to compromised WordPress sites further supports this, indicating a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e10ea5277---22493568910.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e2533bcc0ec3c98919f8a1cbc3d8c827/menusevu.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38842084a---6082909088.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/84gcudqoemq0afv82l2515v02a/61806346313.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/74cmr43ndo56bf65bc6nm0ug30/timepipavezafugokebuluzu.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bb53c1849c---bozij.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7pdnlegccetfg0v106r7qa3aun/xebibuzepiragifujem.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b4c367123e13cdb2d80a7d4aacdf23b8/37012893539.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/7924096945.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1644432547---74509841461.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c22462fe2---pogijugosumu.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608680d9d48e9---43088702447.pdf
    • http://dui-antidote.net/images/userfiles/file/11640603206.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a075b90d11ed68011499f6ce6536d443/wowigolaraf.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/de3d96aaa2e5662f92216135e4ebecdd/75346267463.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3f796d005---97429950566.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/728f523a22364acc5acd14c421e3a312/34342381912.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/77568743258.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160733b8a4dc98---medaluvilekazoximelowatap.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e70edcb21---25152118316.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3832849d7c---baxav.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160838830bbd33---tododaneloxasejitum.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c795576ef0d---povowilenawusugu.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbf159c3a0---bakek.pdf
    • https://alshaabcoop.com/userfiles/file/31690013697.pdf
    • http://157.230.241.115/image/upload/File/6938567498.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa044d2a68---40214277089.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=license+plate+recognition+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_off0000dcdd.bin
4310ec8bc5f47a1d05f5d8be7ca7b6ce63af257260d582f5ca29a51a8e70792a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 10752 bytes
font_01_sfnt_off0000f57a.bin
b035823cc48efb948d720819c53c59e26f64fe3f76cf2d4cf9bcd0e5f99e3d5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16812 bytes
font_02_sfnt_off00012102.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 16792 bytes