Malicious PDF — malware analysis report

Static analysis result for SHA-256 f503704c3f445f29…

MALICIOUS

PDF

86.2 KB Created: 2021-08-16 09:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e79725b499105271e078bb9d06e49926 SHA-1: 82b4e9927ff65cb4113ceac33d4ebc1ff4035108 SHA-256: f503704c3f445f292cfea81ef8c1e7bdeb3a1fc5b9c192240363e93c5361928e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The presence of numerous external URIs and a link farm structure suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://thegioidongphuc.net/ckfinder/userfiles/files/vonegafajuz.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e6297e9d---dadogajomup.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f76cf1b23e6d845963c46dae9da4a005/52330310038.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160da6d6c2c828---nuganadixikipid.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/88027313249.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8b3af4c9---33739040270.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ca0e9ae2c4caef4266ff55b3577106b3/gixewipawogowodumofi.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/13450794457.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/sebukabopawizofejimoses.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/gusazazedit.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/64083113427.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3eef9eeb9---fizapoposoz.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/gurudujemul.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/welejulepe.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/lobibapa.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210814055713.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/846rg96vr3cvun584v6r71ihmd/rokugulonufatugobugufibe.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/50523478492.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bc3b7695a---fawasijejudepesuweruja.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/podigalu.pdfIn PDF document text
    • https://ranagro.com/files/zonisawulosavavifivi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5af95ffc1---44806450394.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/deledajatas.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/debomesapaxeraxop.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/tinetepowagen.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/97840180391.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1f0cc4ee81d78424a1dfcbc59ec2ba7a/2013948549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dragon+ball+z+games+for+pspPDF link annotation
    • https://www.youtube.com/watch?v=U9rW2l9OIRw&t=58sIn PDF document text
    • 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
    • https://www.youtube.com/watch?v=U9rW2l9OIRw&t=58sIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16912 bytes
SHA-256: 060f169ad8b337d7e572731b602cbd544af6b728bb868e9671836801c9c41a29
font_02_sfnt_off000131bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 10712 bytes
SHA-256: 73cb239c1b40a30907222ac64d3725aad585947a45060379af879429776bfa5c