Malicious PDF — malware analysis report

Static analysis result for SHA-256 871737bc12632d52…

MALICIOUS

PDF

91.5 KB Created: 2021-07-06 08:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 209d792b513bd8424c5475895ea0a7eb SHA-1: fa7aa2e0f16e1c3b119ff2229a0155a23a7cc4f7 SHA-256: 871737bc12632d52cb95c51773005f845afcf437f8fed4d2ed64fa4d4c48fcdd
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to obscure malicious destinations. The 'SE_MFA_LURE' heuristic suggests the document is intended to harvest credentials or abuse multi-factor authentication, likely by redirecting the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://loveperfectionschool.com/upload/file/wikifatazeri.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd3d8ddc0---puresavulafozemevipuxijut.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/98677904454.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/65646373244.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d2efde6c1---92664448946.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/59957437341.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/40475136538.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/ed54a2f36171bbe0383c633da6a4f1e4/bonotuxokokixijotipafuwup.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/rc6j02fe10f1pisqicu7487f64/jugosagitetog.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9878b1ef0f7c59fb55ea33b59403eb4d/titurabajesa.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e12e01bf1---degebiwotipupar.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160992febb7313---75557268249.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xulowogevalazalibesexom.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f80f3ce5db68c7026348c48ea93a09c9/tedomoditaleluwerax.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/92205656119.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9637b7bf0---taxobinofewuximuk.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vupekova.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f02d208a---xusuredawusijojof.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/zusopumuxokin.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabdcc7031---49642985026.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/bpk68gcrpolifr83u7i9n5s3ug/83752904591.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/51263828f69aac76bcabf3cf58f6f67d/xifimuwa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7b85c93f90f8d4f9699c84f637b01d1/16952988407.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8e4010dcf---20103653100.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/45212560398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=function+of+peristalsis+in+digestive+systemPDF 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_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 17444 bytes
SHA-256: 155d4c42a28dc776296d00ba05255b05b846fab9592e06c8d4512a164cfb7765
font_02_sfnt_off0001467d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467D 11220 bytes
SHA-256: 6e35b5ea5ba40d2dc3bce7856fabedadb2ada4a38df6b7a465eb3fe93d8a406d

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