Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65278e5e1ee60b0…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 22:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 018ef7e583d5ce05356702a85957dafa SHA-1: 0166e762eed1d0837882e1ab8c5ef25aa5643288 SHA-256: d65278e5e1ee60b08c61b68f6f327e716319fcf459bc195d726ecde8a1006b91
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to a raw IP address, and several links hosted on compromised WordPress sites. These links likely serve as lures to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=computer+information+and+communication+science PDF link annotation
    • http://sklepjola.pl/userfiles/file/zurusog.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/96638510568.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b98df268fe9---xamefaliwidopab.pdfPDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081506353e7b---82750231822.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/4194214097.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/mibogirexovasejususojaje.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/sizeruxiguragotukofivo.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/93581d773dbe65c73ac36eb9ce9b9d55/26120802807.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/nokorejel.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/64338937744.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/lufewowabikusimexam.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b9ea09b9cfe32cd355cc7cac3a11531/repatikabetosewifugodoxal.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9f7cdc58---xazamagovolurudepemogib.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3b1ece17---sofikir.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/ganedeweluw.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba213298a---zatok.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b4f0cf2ee6929c09f9f7019c279902eb/zexusofemifojidemipuj.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074b59666379---banagizakelozeporarizoz.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/mubuvirowuzogar.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/gunubijezit.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/67667353742.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89b35311d---laner.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/93244352757.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/70676396719.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7930f3d164c5fec20c057ef5a56f498c/gekuxofa.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bf794e0f0---vumugaxavuzazedotunolusaz.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160869a7d65d65---31770567475.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b47bbeff3a---79548122980.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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 17124 bytes
SHA-256: d9a2fbdc841b047f654d27c6daffa9e37b7ce6cc47fdc01489c3626f2446ebb9
font_01_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 10864 bytes
SHA-256: 73d8dc2e8ded96708ec65141ca253a363514b851cdf580941c664e53efee746a

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