Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a68fec3e6a97f6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 09:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 312d39a213935fc1b677989afe68e2d6 SHA-1: d4cb1b633c17712f8fabadfb586cbefa94a4f5fe SHA-256: 56a68fec3e6a97f6c4d88ab30eb3cc6a3f167c07a0129a538a0adde5333341e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://crewmak.ru/uplcv?utm_term=aplikasi+untuk+memindahkan+data+dari+android+ke+iphone PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161438407aeaec---linojalimep.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/logefimol.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/vevasope.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161420d2d9c7ad---19099214240.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7c3f15fe28d3425ec05e90ca72251151/28272104533.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/najazunevujixemupazafuses.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/28455464200.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/47639087059.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/21658585251.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/82282874618.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161393dd66a5ea---dadawuja.pdfIn PDF document text
    • https://menu2uplus.com/images/file/wikedufejemojoxobafozol.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161411056865e5---momaxakotedimonago.pdfIn PDF document text
    • http://bienbao.net/uploads/files/gotavas.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/22177334564.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f1d2610bf9f84675be8c3e5b52d99e9d/50307821762.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8a2cb29d---2917357705.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/suxapezadefiwukejatep.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tuxifumubutelow.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b39629cde8---87796195583.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/53788363584.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613327ba33633---59486410184.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/1747734168.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210916000707.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/7702166588.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/zezufukumemibowazirewi.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_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16588 bytes
SHA-256: f448633a3dd0099290a016a6f98ab6cff630e91cb5f02bd5d6e1f2d1cd30efe1
font_01_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 10832 bytes
SHA-256: 7ff19a97d8add386a2df8d434e89e87ea4d631428ab599b9180b78d3a67b342a
font_02_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1