Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83a148b1723a4a2…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 18:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 488c7ec5dbe6cd81b744846f8b89d276 SHA-1: d1acb591e1eee8af11ac0a3b1d2b3a5bc1a1b44e SHA-256: d83a148b1723a4a2af4c8337591d6d80d91633bcdd8fffd6ed312c6f5ba32760
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs, such as http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da13a8bf38---lufewodesiposek.pdf, are likely used to distribute further malicious content or phish for credentials.

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 https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/aeffa053e86a84883c7ac0888e247a39/50956479194.pdf In PDF document text
    • https://southwestlooms.com/admin/userfiles/files/wirojobibegat.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8834a447b2fea9905f6a7df209a1cae5/25813572644.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8004ab31d61cc069bbbf28798030f21d/vigezomagamiviparukokupod.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/femakanetisizabepe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/inrpbsgkvog0jbjc2jb28llnq9/13560797319.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/25769129390.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/80151001484.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826a69a8163---59686678442.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e4762efec0a8ba0b9668a30c0e656215/67264018214.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/budisaf.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da13a8bf38---lufewodesiposek.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/42937021582.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/rowebemovovumigutob.pdfIn PDF document text
    • https://bauarch.bg/files/59424432474.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/pagavawelototijunixagewu.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/6206674605.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/73236492b5e6a9583bc994c79967e2a3/67606960110.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/92773766442.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/be1e2cbf9b9de35b832ed8d41b4a01b6/35886344653.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/72611917316.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/kujabosiru.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/4727278493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=roland+rp102+manualPDF 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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 18424 bytes
SHA-256: 16d3ff003678b38f69f859357ec6d9ad4e0f1ea845b7537a2ea706d4f2533a5a
font_02_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 10500 bytes
SHA-256: a90554a58c4c49284e86892cc9b28b8f213bbe66a6fe90069071032d01880766

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