Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e5076354138bb6…

MALICIOUS

PDF

85.1 KB Created: 2021-08-19 19:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 084c9dc0e9e73e2e59185eb28c669874 SHA-1: d6798b839a7a421964520879488b48ec7db63500 SHA-256: 85e5076354138bb6f577a6e5f470c2062a8dfc66680122784d07aa58affdf46f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ea7f61b72---28827759914.pdf In PDF document text
    • http://studio-rivetti.it/userfiles/files/duniwigitesudisizusu.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/kupatidufek.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/15137473609.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/jazadafekuzag.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c82a05ef5cdd53adfcffa08888fee09f/vatulogixorolokopagoluv.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/59554907709.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/lafevijamutavibamefunepuf.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103b43d903bf---12242810810.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/70162994856.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/73620961714.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16112513f65937---jafoligilaxefokaxegid.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16089d74102f7e---tuzufowipifexipajan.pdfPDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d39c0c1e4---54128309078.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/45574971793.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/77368128b52d538230e0762017b044c7/kejukemasigizopitek.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4450fb70cca00bd11592a9db831be6dd/55105536276.pdfIn PDF document text
    • http://www.celso.org/download/54959235605.pdfIn PDF document text
    • http://teresachild.com/upload/files/34328778017.pdfIn PDF document text
    • http://sun-eko.eu/files/file/26950156257.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/sapewupozotutirabeguze.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/merexamugurirefagozolosep.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d64c1bb36a---6509203755.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/latadotaf.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092af37851b7---nexefofakebefisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=beginner+intermittent+fasting+meal+plan+pdfPDF 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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 17392 bytes
SHA-256: 4609fe02b335871ca23ab68724d88a961ea34a16137dfc7f1db3d7a41b9f2515
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 10776 bytes
SHA-256: bd1f70cf251bbb9f85475da1ad76e6be766aa3fc44f83039fe6f50fcee8932e1