Malicious PDF — malware analysis report

Static analysis result for SHA-256 1062c9cf5e69c723…

MALICIOUS

PDF

182.9 KB Created: 2021-07-29 22:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bc2352e5d2a08db1f69ca85ed748f6c SHA-1: 930f920b4cabacbf3549cee26824df771fed2036 SHA-256: 1062c9cf5e69c723da9166d049be802644b84f25a7f400e9d58fa8953a20f07d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://nomylo.ru/uplcv?utm_term=el+titanic+2+pelicula+completa+en+espa%C3%B1ol+latino+online PDF link annotation
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d4d5840bedc296cdf2859372b353ef53/77551274839.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/dibug.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/19e5ae8af3e0bff6d4ce585acfdb489f/79435990896.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e95f4c32bfad0406029575dc5e75c716/vajenitatagilaxewofed.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/24055584622.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ebktnqb029eedvdhd3b7tfluqa/14156709945.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/25ed0a01c6dbec842a9e3d44d03de157/73215074640.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f885cbc3---birez.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/zufana.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/bepogu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa27e61bf9---66472356704.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7df86a114b3334bb4f289308221fca86/dozinalotaw.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/71917978760.pdfIn PDF document text
    • http://ud2-140.com/files/nerogevisimipumavalizoxum.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/34614919688.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/m6c9e43eoot56upni06or22eq0/45333612660.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2d46d1a4---fiximoluxajuwuji.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/ecda24325d4036ebf40ff71dea0e4f8f/42533159393.pdfIn PDF document text
    • https://dm288.com/slicice/file/ridodobigozebav.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/65189480222.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081668691e04---30300076871.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/soraminizimumozimarow.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e0b20204103f17db93573aac3f7bd1a9/18044946838.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a86152b76bb---53914388186.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/nivofilepinefiz.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/68cdc8793f7bb14d95eee2c505d7647e/28782180732.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/nugotupojumewinebujidi.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_off000265b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x265B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00027dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27DC7 20048 bytes
SHA-256: 26393be876429338f6ae22e18a62bb54da38aa59ec85fbf5f6d5ab4077664e11
font_02_sfnt_off0002b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B171 10844 bytes
SHA-256: 0bf1277ebaad7445a03d316368cf16411252f238d4833918b08bde9437745b42