Malicious PDF — malware analysis report

Static analysis result for SHA-256 285f424ae9caf37b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 22:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6fb19e914964d68a48440762659abee1 SHA-1: 051aecd31c24cf7338374a61e2ee409e6b6a5a00 SHA-256: 285f424ae9caf37b3e7f835a2eafd20587b0354fe51e14ecb031cf952d6b6013
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aarogyamedico.com/userfiles/file/47101668234.pdf In PDF document text
    • https://webmenuplus.com/images/file/53134057436.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a631ef6a4d4---96534120940.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/18303757335.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/41367068568.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61867348bb---sabijewowate.pdfIn PDF document text
    • https://turbooto.vn/upload/files/tewaketo.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/42810753410.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/p6it0b9isakgnm964ib4e6ht82/38486117019.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/zuvojotuluxim.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/zakirexezenagali.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f8d4abf18f3fca7feee9ed6989cdc168/gokow.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/delabelezasopo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040451233501.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/xiwowalakesovolix.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16114e7b5601c2---52315305574.pdfIn PDF document text
    • http://vhshf.de/File/20855680029.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0b37f789---gikibawuzasokosobawej.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/goxomemijemetivadakijuba.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e50263cf3---gawel.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/7113a0b63240cf69390a5dcde2bb7bb0/30313224678.pdfIn PDF document text
    • http://leguido.net/files/74484588814.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9nekiafpi6tkgc921jrejkv30v/78509670458.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/87797204123.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/wirurewifoloran.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/78962001559.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/bezazimeliroliwupuroregu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=swimming+pool+design+and+construction+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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 11224 bytes
SHA-256: ec0b65a56d2a567c4c5233d246dd4aaae85feac497be6c3388640c52a2824501
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 17372 bytes
SHA-256: c51429e671e3188c19f186a51bdb929126a03a1ded58edfae9162adcd555063a
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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