Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c86214b7c2694a2…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 11:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 606a72cfe4eaf5e3f7142cb33db1c8f1 SHA-1: a68b6d2584243bbb3c960efa656c438735f1fabe SHA-256: 5c86214b7c2694a282f6f7a37db342850535068f51a1ed42e4fca2a4ec2cb37d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://dd-eng.com/files/files/10049051922.pdf In PDF document text
    • https://myclubowners.com/userfiles/files/dufebedofedababovaseler.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e0a9f19edca09eb5199818177029b9d0/14515548095.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/6360649579.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/vobutofujizerofabe.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/153aaf8f5982b85ae66a119b0fc6c6b9/mibaxidafivuwovuzuxevusak.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/76427583243.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/xikizogijukizewag.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b18ec80b08e---tefifuruxotolapiludosode.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/52690518310.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/kenizapideverovagaro.pdfIn PDF document text
    • http://cobmedia.hu/include/zavoserenabesatusejep.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uapmue3ll630smd2pskh2i5s73/zopebikojovavosugus.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5e1eef05e---61178472553.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/10290611442.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dc57ffb52953f22dd21224e47587d722/kijenilasezewosejalew.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82445200752.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210510135721.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/9e70fb59d13cfbf9af22e0acc04bed23/goler.pdfIn PDF document text
    • http://dsagco.com/Upload/file/giruselexenitozesaxa.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/4908226805.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e25f316180---baminadutudisevuzuzujar.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/xusejasofikam.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f10497d9d---fuwagatevazezixoluzibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wake+county+register+of+deedsPDF link annotation
    • https://lapdonline.org/file/12838644851.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_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 17840 bytes
SHA-256: e6c211ebc9734dbbd2a7ae2784dc910603d7badb437ceca5630347662e3c0fa0
font_02_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 10904 bytes
SHA-256: 181ef1c2f4875df507269a72f45cf68850159f0da2051074fa8875415e197b92