Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3a44828ebfe3cd…

MALICIOUS

PDF

74.5 KB Created: 2021-09-11 20:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f8e055aa4e1da2ec60e9f7fe7b47cd0 SHA-1: 962bdb13b0451e404fddc40c4cad4497a7bf1942 SHA-256: cc3a44828ebfe3cd9cb930deb8980b56292659f2254178096255ec53e2f0290d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains identified as disposable or compromised, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure and URL patterns align with common techniques for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=best+gd%26t+book+for+beginners+pdf PDF link annotation
    • http://hurtglass.pl/upload/file/jelowogepazixegutukomabe.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/vigedevojefositojux.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/44716870517.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/mibogubodu.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/jezivude.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/67104442782.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///84160168019.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/72089850237.pdfIn PDF document text
    • https://mashura.co/userfiles/files/kozasudigi.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/gobafivurafupumowob.pdfIn PDF document text
    • http://tcihk.com/userfiles/24555173793.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/fives.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210906092746.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/37519151805.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021912235660.pdfIn PDF document text
    • https://datajournonepal.org/files/tekaxifixato.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/bemaxitisini.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109110218033434.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139d362c185a---romufeda.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/gugejedimivelalujogonew.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abdd7450c2---46721663683.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/48891724166.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cbn1jho43cu1936q4fv368m79i/30371777497.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/doditoru.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/kanikexejexodoxob.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_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 18816 bytes
SHA-256: f9270b572001b3fdb90d20e5dce6ab06e7a3c0e4eeda9dc3afc664809951ee9c
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 9852 bytes
SHA-256: d15e23bf2b5e53d74e6ba11c1afd600713dcc56e33e35e17c7ba93b144b9428c
font_02_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1