Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46d1ccfb59af954…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 06:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85639b6d2532cdf5c0646d14306a9f18 SHA-1: 9fd2941b125286e459e84309f3868c97503d0ac8 SHA-256: c46d1ccfb59af9545494df9ebdb245969d843ee587cf0bf03da397877b3ed5fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to external sites, likely for malicious purposes such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.mbk-montage.nl/ckfinder/userfiles/files/sawavuw.pdf In PDF document text
    • http://amandamaitland.com/images/file/61833259232.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086918fc33c5---kolajubizomifepereriduka.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/72334416675.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/97383504219.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210621081115993.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210818_92668FD623884319.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/82890307623.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e39634260---99640002575.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/23322666999.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bce9e2b89a2c1f188cff3a2ea8459f1/nuzepifotuwesikefukus.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a8b0330cc613c1a0564ff9128eaef961/30240875311.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/resasolilinurizasipime.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ac6764283b2583108b850014585e85d5/xilajonu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160fd95d3b0cfc---35619147567.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/16353822890.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/99108091375.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/rupimibego.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/2qt6dgv0c522viqeqlpppamt54/xijefo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90deab1a3---selirodipefitegon.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c50600ba0---rujezapopedupijobakezadu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j288r2dh3ug9qe2ft3o6u3d3f2/92902456761.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/95116688748.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9744dd64bb---tizavutin.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pomigebezoniti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=frank+was+born+in+1933+riddlePDF 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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 18424 bytes
SHA-256: fe7c98fca8ef4f69d733e3b3a6c496b6f50fe865301ea9c4947e6698af2d60e9
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 10832 bytes
SHA-256: ec2cadc377eebab0bc995826e687fb6f3a75a20d01793db6b9ef53ea54256d39
font_02_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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