Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc37f9d6ec07907c…

MALICIOUS

PDF

94.0 KB Created: 2021-07-29 14:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be78767e7166b918bb8259ce8ede9333 SHA-1: bdb5512f2b92d0fc9ede40fa7cf1d770492dce4d SHA-256: bc37f9d6ec07907cf02a0262386e6ba1465c4481a707e7436dc5d03617e54261
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, designed to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or malware distribution scheme disguised as a download link for popular software. No scripts were extracted, but the link farm and heuristic firings are sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kristinanamaste.eu/files/zowaxurawaweluvodowiwenes.pdf
    • http://hzzxtl.com/UploadFile/file/20210723110011146.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe43f15931---rowugumadona.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gjhaig6f58ceusbgifnoluq0o1/53583264586.pdf
    • https://lawyerupsmart.com/tempimg/file/83260950987.pdf
    • http://ghibms.com/userfiles/files/99087762670.pdf
    • http://nousgarage.com/userfiles/file/zanaremagipiratojewib.pdf
    • http://asja-doll.ru/userfiles/file/sazuzejoluvegulisas.pdf
    • http://edu-family72.ru/content/images/uploads/file/89465255068.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210627_70950FDE95428C43.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfc44c02c6---fetofodovamidupiwegub.pdf
    • http://box8websites.com/ckfinder/userfiles/files/magefad.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e75486813839322da7e13bb07ddfb86d/xovoxakuroroto.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077de78a2e7d---sepufajesixivotima.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/k73gbbl928v6kfe7d3b5gnqgcg/37766838935.pdf
    • http://vorne-sitzen.eu/pcms/content/file/92538293406.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/67ee1a413bbd7cc6829725bdd609d19e/4027808249.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e094e6b5e45---dokirapakebobibejot.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c5f06ae2---24938203461.pdf
    • http://centroolosprato.it/userfiles/files/juvozigasinewisev.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d749c11fea7ad0883a670a16758fad24/rutedafesagexevepajosoxak.pdf
    • https://vyrukrc.lt/userfiles/file/ruvemovutikijonijase.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/52691767766.pdf
    • https://robert-zauer.cz/userfiles/file/zaxorejawisirekekeni.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160966ea9820ae---74646120946.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=grand+theft+auto+4+free+mobile+apk%2Fios+download
    • 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_off000108dc.bin
a0d8d933bea75c8511fea6a885162bf99377f7b25a46ba227420e464047dc284
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17332 bytes
font_01_sfnt_off0001361c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 16792 bytes
font_02_sfnt_off00014e33.bin
960df3c8564af0fbe7f75eededd2beefc6c0ba66a0100738d102b02a7c116da2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E33 11332 bytes