Malicious PDF — malware analysis report

Static analysis result for SHA-256 daca4a9464f03b59…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 13:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0147f22cb2d243c9815747acd37bbb79 SHA-1: 62ebe4e7c25cf958902654aa5d17fe4658083a88 SHA-256: daca4a9464f03b590253cacee961c00d7651d6b67890021125146428ccbbb7a9
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to facilitate initial access, likely via spearphishing attachments.

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 http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/6je5tkmj39pfvfvnt2tlkream5/22789269225.pdf In PDF document text
    • http://nriloan.jctoursandtravels.in/files/40097211685.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607823cc69aec---mobapaven.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b856e2b8e0---sekuduzevedopoxadifaluk.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610903385a383---61285626303.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3e6dee29---poxexawi.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6c7ddc81e077803b2c7ffff7240b8759/fivulavere.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/5288e47697cd78f9796a05311c074275/wujuzaluvavozukux.pdfIn PDF document text
    • http://yaan121.com/uploads//files/202108030937097131.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/79929073354.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/mepij.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/fitis.pdfIn PDF document text
    • http://hkwwta.org/userfiles/benikajemig.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/44645521807.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/26408129687.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/25408671141.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7eb7d913d765eacb5886bc792625b53e/zoxilosudumekazetufiteta.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/23008262832.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bb133a731---75516761722.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/14457503173.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d0b0c0ca258288bfea53faf84b9911f0/wojizelomagawenapefeloniw.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160aee818cdb2b---12136592026.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611608d90ec40---33403100693.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1c238dd0ce5af80294735a6947efb92f/xexiperiboseno.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/tajidopafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=evolution+of+integrated+marketing+communication+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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17584 bytes
SHA-256: ce77caf18f0bb17ee46f591c2ddf2f0a3fdad2fd7b433e18a91234352ad201b7
font_01_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 11036 bytes
SHA-256: bb496a7ec96ecce45c9c81652ac9b3ea5e954a9e73f371ac811272d3fc55dbad