Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a2fc173addf801…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 08:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c242d676c6be375999b7aaae5bba5c1f SHA-1: b76d98ecb242f1cc90e0f32074a1df3c84ba2028 SHA-256: b2a2fc173addf801d6712e18bee5baab2aae0769cf22289fbe1090e815bd92cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is likely used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or further malware. The embedded JavaScript stream is the primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aee75f1c10b49b95b302a0d63e4e3e89/jenimazomer.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6a4fe076bc9bce8222179dc7a0cf58a7/xipisutek.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cb7dbb05---91436436172.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/vivazolamirorepozurezo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/72132053161.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/73378923686.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/53680974023.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/dolujosudile.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/vft4f42e751usvt7ne2mmbcb11/lekeju.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096938487714---lajosakutonim.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/a5d92c34c3c410a18ee69adfd13f9ac4/15009840235.pdfIn PDF document text
    • https://istanajp2.com/contents//files/sawojukajizudilota.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16129b4739b767---rinesekolazebogawulodus.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/87064449237.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ah0tju2aq72u3v92j8sd0sd6aj/verofududewijizaxabod.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202108292321181018.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/dajafoteromeveragefunot.pdfIn PDF document text
    • https://everestart.com/images/stories/file/gazuroxepulujelodadovuv.pdfIn PDF document text
    • https://loyd.rs/images/file/kerawinevilop.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b61e38ce9d34f929fee0674893159261/vumokowawumux.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/soziwoxutiwegi.pdfIn PDF document text
    • https://manenshop.com/upload/files/64472994712.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/52114552429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=10th+maths+book+with+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 17640 bytes
SHA-256: 1d8c5f0def12767f59092e849f48cbbc3d9a4bbfe9994bdc8b841b69b4ef8c3b
font_02_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 10720 bytes
SHA-256: 0a8cca49e377b87007ce904518a4ff8d53937701dec25473ef0d69ea01f3fffe

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