Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f5bc34ce93c21a…

MALICIOUS

PDF

68.1 KB Created: 2021-09-04 02:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c3395cfd931d4d701e907baa4a2dad6 SHA-1: af7a216e6cf9eb70fd414531c70e7e2eb202dd83 SHA-256: 88f5bc34ce93c21a8e70214c1c8c247863ae2170bdc05700a50def510a9df449
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates a screenshot-like appearance designed to trick users into interaction. Multiple URLs point to disposable hosting or compromised CMS uploads, suggesting a distribution network for malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 68 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 http://www.ecostroyservis.ru/File/sekelibugavufejelolofo.pdf In PDF document text
    • http://18554080.com/userfiles/file/logubuvokutufuxamesole.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/folotetonalo.pdfIn PDF document text
    • https://digireg.si/upload/9174086276.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/15501650885.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5968a2fc---53721978660.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/43762517332.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7745ff0b3a---gibope.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6409f3da---rerolikoturimuzujazenefuf.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/97782857825.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/pozawamuwosudi.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/kefixilanisofaviguzero.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c05dc1ee17---tawixedaxedopofo.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/6112088418.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ti1j7appuqit6qj4h6i173eeki/besuvivuxixofowejo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/94820086691.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/20875494643.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/59483251536.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160856b1faf629---28356976481.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/72515464184.pdfIn PDF document text
    • http://cobmedia.hu/include/61340580793.pdfIn PDF document text
    • https://avenue102.com/uploads/file/gojevujikilomokegotif.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/vazibide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=plc+programming+techniques+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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 14080 bytes
SHA-256: 2602c09190403e7fa3201d45bab1f1b56c4eda987d61147e90f8ac15fe706b1c
font_01_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 11312 bytes
SHA-256: d300aa3ef2e6da2e0ea73d5072bfa7b59ab604f5aa6c8f2a717ad55321695473

Open this report in the interactive analyzer, or submit your own file for analysis.