Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fef93623b3d847…

MALICIOUS

PDF

93.5 KB Created: 2021-07-01 20:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb880343044cc487e458b0762c2b28b4 SHA-1: fc8a7f98e6845de5cb1a0767f9d3a29ce5c6f35b SHA-256: 42fef93623b3d847f015204109597b9ef9886244730da456cc2eb2aaec7367c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to numerous compromised websites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to distribute malicious content through these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://technology-mp.it/userfiles/files/78289490439.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796277822c2---5939528486.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/94649782122.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/37242433724.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/44809412936.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/60199337195.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kh6qfm7k933f50mep2orc9qanc/pojemudu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49b7eefebdb43b71ca92b85eda26d63f/majedeku.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e4d5b68fc62470a05aa0cd24ed22527f/lebowepavakoferizesif.pdfIn PDF document text
    • http://landia-print.com/pdir/file/tubaza.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/57b514fb563a66665bcaedf55404e310/18640217939.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd87a98368---823893623.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0f20032a---87985095998.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/90371076900.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/51564763650.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/riranok.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9dc853cb5bd0bf92c9e6508a264ea175/36199112706.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2cf7fe8c88f47be29c87eef1a1b194a5/92650693556.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bevokiwuvugeronavezixef.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/sajotilifunisabuf.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e8d99c2f9e6746492bf71a14e2de77c4/tapuxuxuwupebezuv.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31a90c5e8---34573197758.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/scpmtqk56asco5sa2edflc7erl/26928928224.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3f5b4d4a41d2638762d762f8643242c2/jenefoxasataxigulajobu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d5cda6f6e4a4f53d0ae9ab45d17f1a00/53359323867.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074695de68d0---46666673275.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5459e1ec0d9a0d44d527c1537b58bed9/lufife.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c916eca7bed---xelevefav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=a+bird+in+the+hand+is+worth+two+in+the+bush+originPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 22212 bytes
SHA-256: 2a04d8e94c91541a13591280f7c224dcc2e109ad26f89babf2475575f482fd94
font_01_sfnt_off00012beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEB 10788 bytes
SHA-256: 7d70dd33f6339422ce686bb2613864f1cf9e37e6fd439650b4c4896292ee2fd2
font_02_sfnt_off00014489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off00014ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1