Malicious PDF — malware analysis report

Static analysis result for SHA-256 915aafff4f37d0bb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 13:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9abb483c12a6278943a3594127a1e67 SHA-1: fa3faca825a44471d4aaf849e354f320379a5d93 SHA-256: 915aafff4f37d0bb27675c33046be2ae428e6035ba38e7c4097568553d1caa32
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The heuristic 'SE_SECURITY_BYPASS' suggests the document may also instruct users to disable security software, further increasing the malicious intent. Although no scripts were directly extracted, the nature of the URLs and the 'ML_NYX_PDF_MALICIOUS' flag strongly suggest a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://irlanc.ru/uplcv?utm_term=undetected+fortnite+aimbot PDF link annotation
    • http://tsrmvolontari.it/userfiles/files/79418928973.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/xojimaxukufemiwaditawu.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/kowagodejugowuzi.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/mekesazikesabaxubuzuteb.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/36174664621.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/rujite.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/22372212604.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/sumemosap.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/40363951278.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/tatotonir.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/94663984102.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/70150235128.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbb84bc3a---zinibigevujipi.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/41729621617.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/furunolitutig.pdfIn PDF document text
    • http://www.tamilsaga.com/ckfinder/userfiles/files/35586197831.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/pitolejilorem.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/13804635962.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/junoxod.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/bolobamenoguvis.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/dadelojokuribex.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/addaa137e6df22f1713c030e39264fa2/45205478672.pdfIn PDF document text
    • http://it-hair.com/userfiles/73564949733.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/50htb7t304tpbtanrbru30920v/20933358915.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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 10568 bytes
SHA-256: af809b6b5d02e146cf07e5ade0cf00132147ee2ddeb2686366a7631d3cd46c84
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 17928 bytes
SHA-256: ee35afba3baa91bccc9c086227f4b19d7ade0a7679cc0651622cd223a637ce31
font_02_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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