Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef46a5125967cb0a…

MALICIOUS

PDF

74.6 KB Created: 2021-08-29 09:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 015ef875ff241f14fdd7dedb6be0178f SHA-1: 662a4e4cc017fd93ecfda3c12751a7dd7128aebc SHA-256: ef46a5125967cb0ab48e2cb8239e9de45fdf6cd174ba0fc77efbf9c557f2285c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains, likely intended to lure users to malicious content. The presence of multiple external URIs and link farms suggests a deliberate effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://wastran.ru/uplcv?utm_term=how+to+find+the+common+ratio+of+an+infinite+geometric+sequence PDF link annotation
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/68474485652.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/h490jh2791ter2unap77lgb6ee/maxizujuzosizefifimip.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wavinuditokugofep.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/7415850787.pdfIn PDF document text
    • http://ridendo.cz/files/file/87939714395.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/winowiragenofifelafifuxaf.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fa2728ea51b8a60b721b321c51e052c4/pugalunegabozaro.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/sebododate.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/82293871056.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f52cac3b8b---43810025605.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/wizesadaxizuxubumoled.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f51f14ee8a---valapanipazutewujuzo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e39d90cac0b5490415d622da31f611e5/84410875301.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6adc0161f88dccd8a94009388827bcd2/79697072439.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/24683188686.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210621101103.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/66t246udji081btvac1hbqd0n5/22246313851.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/18961196805.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/2141222126.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/32859314f5c2d774ad74c692a993e01b/39995960317.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/6764928331.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/jetolusajuvaju.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8be8a310d---zokozipisegiwupepa.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/6564821669.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/57973463153.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/44ba3c58bc67070893d908db951fe271/gaziwataxetup.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_off0000c128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC128 11200 bytes
SHA-256: 011e57407268a67b7d50716743d1f975caf0aa60e83f2b2281f660b3cc70aa56
font_01_sfnt_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 16044 bytes
SHA-256: 45ba52bc347be594ddd2b2f9aa32541909983b8f4ef2fb880dffc50abe619c1d