Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1f1b6fc01cae19…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 18:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5506d2abec0d2bf9c61b73822fcdb143 SHA-1: 53e0d38a1862fbd685287e8aef093198fbf0570b SHA-256: 5d1f1b6fc01cae197ea407ebde835781a6a15f85cc640a38a337c4d6cd0f39fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links likely redirect users to further malicious content or phishing pages, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mvservice.it/file/10097653191.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/km7a3f0lgns5e3i12orp2iuu62/40213070533.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/bulexutepixupiravara.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/37463528323.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/84674437244.pdfIn PDF document text
    • https://yorapp.it/file/64887414564.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/654d0ea78a7e26aa39ad79a55c815322/fabukutofexogegulofe.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/45726477714.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vibakaw.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/29833030071.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf7ac1e87---mamokaresexedikugen.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/73590370892.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/xemusaroxodezab.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ef468d1aedd8425dddc91aa216c45eae/54933776865.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0set14sjqcjur1drfdhdsjade5/toxowajurafakewetu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e22591bf2958787bc87173e262fbe9c5/62447535441.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6aacbdbd96---kavidubufilelemede.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/84298506910.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086069c1bd92---71239456467.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/vawezusenesiz.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/98864585619.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3d52d115---rudupodoxadezovusewexivar.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bc6c07726eacebe4c9cbf16dc4cc553c/tivefa.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2e2343b4---gezuw.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/91862477147.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/86672719133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=different+types+of+hands+for+dressesPDF 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_off0000b5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C9 13936 bytes
SHA-256: dc7d2ded284b36ff906ce7e2e41bb65e772fe6af5d920fa005d21388e0fa6717
font_01_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 10664 bytes
SHA-256: 4a658cf885d7426c5791b16f01561b39f902515e20b0e6bf301f657dbf142c5b