Malicious PDF — malware analysis report

Static analysis result for SHA-256 57aff19a3acee16b…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 19:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09e524c0c13d4532ae9bcb35b2dcb919 SHA-1: 55baa0c603b63d8510e68beaa8766ccd9ce1188b SHA-256: 57aff19a3acee16bfb28c4ba014d0f065252b8ee14e563d31185348d783f0b85
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://garglob.ru/uplcv?utm_term=john+fogerty+wrote+a+song+for+everyone PDF link annotation
    • https://sasalidayanisma.org/uploads/file/91173615806.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6b49fba1---jabalezubij.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/zenakizex.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/tezozulobinujenupiditepa.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/55252274816.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/96056085338.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e9eb2eb01---pupet.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f33571e7cb67b2252f22bc76fccbde3e/tidedage.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda713df48---kodapinoxogeji.pdfIn PDF document text
    • http://logicamail.it/draft/media/dijesokopawudarazogub.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/96933559478.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7a8a301ab2e14d16ad5924b7991e451d/sigepowaw.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/wapabewu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8081d9ef7---xexoteselu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fipikulasokifenusawefor.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e92f9b07a8d11df1d8b7ae8d0bfb3f4d/jijadadokexodiw.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18fb412e3---66310297356.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d3affb7e80c312b1fc6ee7dc4d0171b5/zaxemesox.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/movumadapasik.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/34591750913.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/xelapatepi.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/44892384595.pdfIn PDF document text
    • http://anm-av.de/uploads/files/watejelofikijugibabawewe.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b9ujlagc5ekck5laf9e83iq8ub/voxujedutosimirujopajow.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/kalinubasewibodasososewi.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/47730807780.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/togolutanadimevuwosezutul.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/5071005163.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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10612 bytes
SHA-256: 3e7547b9407328448608925ede5515e865b2b8267968d6a17475bfadd02db3a0
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 18852 bytes
SHA-256: 1c7229cbceb8df712937cf809ecbe5772cbdc5c7d67b2f502012a383fdad1489
font_02_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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