Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fb1538a1a4b21a…

MALICIOUS

PDF

83.2 KB Created: 2021-06-28 09:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 335a0c01a4cbd88cb1bb676d630aad50 SHA-1: 30dc20919da2dc0848e8cb550b55a7952a6ca28b SHA-256: 57fb1538a1a4b21acb102bc2b4cf1b26098a5a06ac7259156db2b3a60342da9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dolmalatrek.com/userfiles/file/pivoxaboti.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608d941478a87---xexafisizexu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/811e84ab2c9f596d1da99f9843e17433/xexola.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/21950292317.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/j6invkndcl1jhbra5j94pv9263/20326356101.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfc3a6665---jipujojuxutumobifopuruno.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4d4659d0---buwozekixabuno.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b3116a48---64193344581.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981fa80eb98---15806111092.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790a6383563---69560993702.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8379e2dcd---76207869021.pdf
    • http://aqbnb.com/uploadfile/file/suxarekofe.pdf
    • http://gfhs1978reunion.com/clients/56625/File/72787976063.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb9950c9b---39364510385.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750fdf1c8b8---jumiwomusavatemewo.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b054083096b---3290843562.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084961c09b87---10626954911.pdf
    • http://www.aluvascientific.com/UserFiles/file/81252611555.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/zisutasexib.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/remegimejofope.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/14297961035.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076609f9061f---jigilamefebimokosuk.pdf
    • http://cpgny.com/userfiles/files/vatifunoraforuzas.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fee7f7b3---58700230215.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+standard+deviation+in+normal+distribution
    • 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_off0000deee.bin
ec8b1a684579070778c652ceaca47a2db820cb9edce8b817138545d7e8954cf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 10972 bytes
font_01_sfnt_off0000f833.bin
b724846d3252a4a142d1b16f5a67588371f6fd23b65792b05315abf9ca0a57cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 17788 bytes
font_02_sfnt_off000126ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 16792 bytes