Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca5dc75949b6d22…

MALICIOUS

PDF

105.2 KB Created: 2021-09-04 13:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f4b77ba4535439391fa390b01e70398d SHA-1: 8ee3921c4e72a02bea597fab8362b5ae25feadd1 SHA-256: aca5dc75949b6d22cbe32ddbabc4b46d7e33befaaf438b11695535f00530c976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c497a09b6f---tanulunapul.pdf In PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/81171683691.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/15805998553.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e05d7b4f7631128344a0474e0ad99d5f/ramofojatoj.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/670cfdf3a2150d6f7cbbf0a6846c1d6e/xitikasutaxibe.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d65117179---12946062926.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/bisodotulupuxume.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/xafawegunamasara.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/hl8j7frfh52pnrnh3uvar3idq0/1617978151.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa315fc139a---45036725687.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/e7b67tv7bttglev2l6tec96hpa/15427763626.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/81b63c2f9ef3abf665133390138e060a/42459651416.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4210894641---35743610343.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/dagekigew.pdfIn PDF document text
    • http://planbmedia.hufiles/82440954566.pdfIn PDF document text
    • http://cabini.it/userfiles/files/93639276546.pdfIn PDF document text
    • http://beiks.info/public/file/6432899331.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c897ec2305---61343432031.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/65746856705.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/8b5483a676ccc639b49ab8729ed4d4b7/2055725412.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/xizunogoloj.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/93422746399.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117194d30---laxixuvowopejesutenapetux.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/78857536750.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/zerutalojaturarikorojuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=speaking+english+fluently+basic+english+conversation+pdfPDF 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_off000132d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D4 18812 bytes
SHA-256: d8d6d25e0caf4432694172b53d6ca2e5994b694d36b2195b8609e8f6bdae4e93
font_01_sfnt_off00016350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16350 11484 bytes
SHA-256: c271eded9b214e561f7313617c95c388bcc59bf23afde4286f76ea4acaf7e6d5
font_02_sfnt_off00017e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1