Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9aa38df7a40b9a…

MALICIOUS

PDF

84.7 KB Created: 2021-07-02 20:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9cae55cef57438355f4b7137a0ca83e7 SHA-1: 159fc0a2031d559ff260a60385f9b17a7940c237 SHA-256: 3c9aa38df7a40b9a3dfbecf8d4bad55720a263efa43adfbb9ba09ea031516b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://catamma.ru/uplcv?utm_term=colt+90+day+fiance+cameo PDF link annotation
    • http://allasclub.com/campannas/file/90828742854.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/78313432013.pdfIn PDF document text
    • http://waypl.pl/upload/File/lipabojusefifotetuzov.pdfIn PDF document text
    • https://aokman-drive.com/d/files/deken.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/43798538482.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/xovisizegebit.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b094c161ecc---pafofimekununewigiwifiko.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/84909be9b15fba374ca2e36f8de1b298/32381614817.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62dfc17e08e0695270f39a5ee804aad8/fozumolenibapakuj.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f596d163---3497032545.pdfIn PDF document text
    • http://learningkey.org/userfiles/94955932291.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a57f9994c04b80b08ecb082b7c595250/14416186274.pdfIn PDF document text
    • http://envigest.cz/upload/file/12095931478.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/41d93b28fa7ef319db13233536557afa/nirituwakan.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/18668466626.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89c5da620---76801506987.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/55699457423.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dd89ff00112eeda9c6500ccdd00accb9/fowadebakama.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2cdb6347---dobodutukuvevolejoxovinim.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607abcc27ee70---71017471411.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/pululipamigusadigokuse.pdfIn PDF document text
    • 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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 10804 bytes
SHA-256: b933ec4b463e6233fa5dfee69a91a6a517b4983147bb8f825c7ffee5c07bf93a
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 17368 bytes
SHA-256: b7e8718370214eb96068a1d6531d27f06d7a3321c3be032ad336ae442a8a8946

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