Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06364c117bf0792…

MALICIOUS

PDF

95.6 KB Created: 2021-09-01 17:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 329649b60bcd4560964b498eb4110fc1 SHA-1: 77e0d90ed82cac732720104ddff281fe1c3a5c7a SHA-256: a06364c117bf07927a9fa814b35a09608373980058564f6baac3176e983497d1
156 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and a machine learning classifier. It contains numerous links, many of which point to compromised WordPress upload storage or are hosted on disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://baruipur.org/ckfinder/userfiles/files/25108673024.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/85168298319.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/bowura.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/48972336763.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/15762108984.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/wuvovewekina.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3ead238416647a468e973e2351956146/58903066528.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/a70rvusdlo5f4egeeup9u56fab/46075729686.pdfIn PDF document text
    • https://questyme.com/userfiles/file/35641983852.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zunavutukamawawilaroguzu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4e36d206---71655010419.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210807200311.pdfIn PDF document text
    • http://guowangcable.com/d/files/89010047814.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b59703a8aa7430554bdc1e39e7aec5e9/55336706810.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/35215086702.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92156222318.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb462195ff---lojakokibufes.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd301b7eb---viremakijep.pdfIn PDF document text
    • https://equalland.com/uploads/File/91685097468.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/8245399447.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210809105400.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/a0g8tao1opubhk66p26eb0nn15/fajaguzinipovod.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/buremagibibe.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/66787282956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=frederick+copleston+a+history+of+philosophy+pdfPDF 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_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 19228 bytes
SHA-256: fbace2802d1789201706732ad95ee0b328bfd794027a74265b08b3cc7301eb15
font_01_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15642 10900 bytes
SHA-256: 38f9f482e0f8fe64daa953964e40b2f02a7098a5e5c381c03eaed9d7cdf5626d