Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a84347db7383b2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 09:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e5cf2264113f1dc9df7918b02c0dd87 SHA-1: 51eea5ea8c6d2f1934168e0a043adc5e1f42bb5a SHA-256: 07a84347db7383b2b09b84c1c476057d3f85234a684a7efbce99fc144afb9a26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lead users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=migliori+giochi+sparatutto+android+offline PDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3c283e7a---sadip.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/fimasojoxariwisizomaso.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/10338607156.pdfIn PDF document text
    • http://exim5.hu/_user/file/sojitozutuzupogivikagis.pdfIn PDF document text
    • https://alpinashop.bg/files/mavevolugev.pdfIn PDF document text
    • http://ruihuitax.com/files/file/wivovetuzegefisowifes.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wenejad.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c36cadd7271553af78ecfed2aa66b783/witetejebanosizoneve.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b785bcb2cb---rixekupapojumuko.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/9538686882.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/lunaluzigojel.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/47790195956.pdfIn PDF document text
    • https://izometal.net/mm/file/64098187093.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/zuwurevajin.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/71270492019.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///45172358689.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tididawaninu.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/darikexidijomuzuvukone.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131038346809---48650763138.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dikatixogavilov.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_164705.pdfIn PDF document text
    • http://novichiha.ru/pic/file/lirimibefixorovepe.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5c0587f6---pelupu.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10992 bytes
SHA-256: ad632ae12a2325afc5798fe2a8235f3506274d67b96a258bc3e94e04a61efb53
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 17424 bytes
SHA-256: 93803771669eb7637d4f113b2c7b6a15322026f5cbd53fe752e52eb40adacfdb