Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75121243714aa1a…

MALICIOUS

PDF

86.9 KB Created: 2021-07-24 03:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ea2392009014265ea54208784d8abf7 SHA-1: 1424d984fe2fa26bfbb5d610a1d56bc50e6534d7 SHA-256: b75121243714aa1a0394f377aa2e9b660e5f2d2ea8eba0d2682fe807930091a3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://santamariamikado.com/uploads/files/62483814373.pdf
    • http://ahchala.com/img/file/bisaxufefatoja.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/01337727d38c79ddfcb33e235094dccf/kajefamigubuzexigazafosid.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c585be4f6c---zijivebixijenezizebavinil.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c20dc04dd39---gubusatilesulumarovebis.pdf
    • https://senhewood.com/d/files/76912078956.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943f4047206---94345891986.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/82854487413.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/kdnon3igpm6ne7q7sagl1h5nh3/7261597647.pdf
    • http://doyen.cc/images/upload/File/lerabuz.pdf
    • https://walkandsmile.com/userfiles/file/32222537086.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b594949962845e28da62922fb535d9d5/bagoretawusefigesase.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a9273639---71809187423.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2gbhan487ad39j8l65rbtlrqfj/15613848831.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af62a0203f8---vapipelemenupe.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/96315440087.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69aceade12---rumuzu.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d2c09771fe5def162301c2673bc92ea/zenajefininoperaf.pdf
    • https://penal-garazh.ru/files/9771337022.pdf
    • https://mzlpro.com/web/img/podborky/files/fotanuvurakarafe.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/1da00b07894845a20364a1f0142f1c15/jimidaxozo.pdf
    • http://casaalu.com/luutru/files/72063461991.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=multa+por+nao+usar+mascara+goiania
    • 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_off0000ed7f.bin
65fd9e04c663293fb345f41c255d05201709c9ec7c58f7d97c9ddd1df84ca055
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 19240 bytes
font_01_sfnt_off00011d95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 16792 bytes
font_02_sfnt_off000135ac.bin
423e50c26d766a839c7f820cfa40c4761c8cc4289463756df84c0ba554ffb1d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135AC 10680 bytes