Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba2f9e173050537…

MALICIOUS

PDF

95.9 KB Created: 2021-07-01 19:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d09c54e5a53516bf44732faab444fb6 SHA-1: 8d8a841089cf688143f64425dcf90323a24eed66 SHA-256: 5ba2f9e173050537646015fa7f308a6989110a38d922644e84a0cca51d32745f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to obscure the true destination and evade detection. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987f1904c74---goxuwavalijutafide.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806dcc84674---69528240643.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v0jrmjchs6v713hh5ocobhnc10/76803693904.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad0c32a3f---24483027348.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/omkfuauaon9as27bm4fqn0jop1/27952176976.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/gojukodezovinudov.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35878e92e---82438208689.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3441868e3c4359c530b0980666747464/disupuvomarure.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609407d5a44b0---84822250032.pdf
    • http://sport-way.ru/img/file/kofinadopeji.pdf
    • http://hasyo.net/files/file/dopenasokiva.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160751f14e7013---70283771212.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a1e3c9fd---wakirewufikalobomutiwowi.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p3gt1em45lcjru7f2359104fb3/133131561.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/92c7f2b4d3efe575d780d9fa6fe0466f/ferinerefaxegilifam.pdf
    • https://palet-school.com/files/files/xamiviluxu.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/7332665162.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bbb3d0b4---kikudaju.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/71a7939abfe634ada51cc35d49e8795a/42180253504.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f112ba6d8026b7b5a0d11ba8e64e87e6/rumivibagarexevim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=korean+alphabet+with+english+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe78.bin
4d515dceb371a9f2ce36f32f1d05119c400aba94c33f4a88651de7591468d03a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 5584 bytes
font_01_sfnt_off00011225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16792 bytes
font_02_sfnt_off00012a3c.bin
27590d28d4586c65d8acffc1443f01c4b6672e4d64682905b4d4c7707e6ad46d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 10916 bytes
font_03_sfnt_off00014319.bin
9665c361ae867a433835d7bb7feab05c1801eb8eecacd9892464ca3d41d1ea16
pdf-font-stream PDF embedded font (sfnt) at offset 0x14319 18344 bytes