Malicious PDF — malware analysis report

Static analysis result for SHA-256 852251ae028e1872…

MALICIOUS

PDF

82.3 KB Created: 2021-07-30 19:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fbedc897c366dfe9eaa9416da82e8fac SHA-1: 09a11fa844f64469289b76940e2e3c74acd0a19a SHA-256: 852251ae028e1872b27ae6f2787196ec961d903126ff6fc6ffd5c4557012e7b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://orbitsecurity.qa/pro_mvp_tech/uploads/file/7377111670.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607030a69a99c---litiromepiregovosurexu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55f5edf6768e38084cf4a94a86108380/54807360219.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087716c4004e---pefajifedexaxapu.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/15154076775.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c276a940199---duzitejizisupizufujuvekal.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/zowekuleb.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/wabusejudoxabagegab.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/naketuvavivutuvigikolulo.pdfIn PDF document text
    • http://vhz.cz/user-files/86165356326.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/39060550074.pdfIn PDF document text
    • http://belst.by/upload/file/soronaxunegavari.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/lenepuxif.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d9f6212e---nizawib.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/papizumotuzuxenavafe.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4b8bd792---41939984278.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/74768664590.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735986c7e0a---luziwobujovikinidivozu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3507812ab9---gekurerodipogapaken.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/taroresetizurexif.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/621328e1a27ef0ad979672bf65bd8c40/52015325834.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4494746277---pokewumemafot.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5056aa4c23---84507049180.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a4d7fab8bec1d2fb6c483bc7e2f4f24e/53448461649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+set+alarm+on+timex+expedition+watchPDF 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_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10956 bytes
SHA-256: a553f85e444fd9cbe73e44f155ee09a4f425652330243c877b94f8ab0755eca5
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 17064 bytes
SHA-256: 6918892ef8f06d6032b4f1a056fe189286dbb5d3086361412129665706fcdb95

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