Malicious PDF — malware analysis report

Static analysis result for SHA-256 4952e539e8e30337…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 02:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5545c7004dd0d7e4372569b070fc8d63 SHA-1: 63610b8d0f007c3afd33a1275a43d66bafa4c9cc SHA-256: 4952e539e8e303374a10397ade8d2ac3e321f5740908e0630bd38895d62c4f73
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 trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple PDF link farm heuristics and a high ML score strongly suggests a deliberate attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://cakkue.com/contents/files/xokolupatukowijegeweguri.pdf In PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/mukotitotanabikod.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7fa0cd698fa5e4e3a6535c8267a7ec9a/muwemoguduru.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe10a1a040---45851302044.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/surediwizewijibunafejiju.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/m6j7q8udo78vgp1o438d78l48o/68180388115.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/siwabobajudal.pdfIn PDF document text
    • http://net-marketing.hu/images/files/47031324016.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/sobupasiro.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/gavukotutukenodegomuwuj.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/72242311466.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/bumafofevositolurer.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/70700221595.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bf500c806c2e9557d24e1bada83dc80/96029038657.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/6778525570.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f53mkmbu1berkkli6h2s6mkuna/gujedazojeligora.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/lisejozogegobelo.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109030418283936.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/92303471206.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1031c95f---10796537930.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/ninaleki.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/55173578594.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb3d301c3---nadenaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=one+piece+burning+blood+apk+for+androidPDF link annotation
    • 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_off0000bdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 18000 bytes
SHA-256: 4645b1e8abff38aecc4ce2391c11bb4db249cfad3ce8c5b2bee98c2ea3f94269
font_02_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 10888 bytes
SHA-256: 9164c5d454b351fd41b16741fc36437dbefae92304c9eb814631dfa223196b07

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