Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d80d65357c01c6a…

MALICIOUS

PDF

86.3 KB Created: 2021-07-16 18:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63f772dc966242f7eb3c36905ced68ab SHA-1: 7a6d29df153cbb3f9575dc645641c618b57c435b SHA-256: 4d80d65357c01c6a4fb432df25cecf1471fe2d6d24ff3d3a68ac49688bf1dd23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://pastoret.it/userfiles/files/lojujoziwigu.pdf In PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/biwaz.pdfIn PDF document text
    • https://maviet.vn/upload/files/xafojoxujulafedarepuxexup.pdfIn PDF document text
    • http://gtshotel.it/images/file/35750554477.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b83c4aa7---89091116658.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/pofirumanu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/27963197071.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb611fdc2---rifopejeribeniniligunub.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/75763204585.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608974f54c23c---sugurivuxomememega.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/91430714936.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/58531436249.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb16496827---ruvigemufuz.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabeef49456---62902355529.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a30e0b153---83726876710.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902e7317ee1---7627825699.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bf1880416dc7a80e6d99a62a9af9f812/ritijenexojoxa.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/70af6343a53d617b7cd05c746bc1a9a7/26878473838.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607793741bb2b---xuzikum.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/jidujanowivakobare.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/28256473118.pdfIn PDF document text
    • http://jarosi.hu/files/file/rofamunaxulikobaxagu.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/85609201578.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/54719056190.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s6fjib6achaqj3r9b1hj8lftr1/nebejiwojiwamosopas.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/walididunejebexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=easter+adult+coloring+pagesPDF 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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 17220 bytes
SHA-256: 85e8c49030f34757594761d39c47786ce6ceea01273a0833e8b15ace65289a05
font_02_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 10772 bytes
SHA-256: 66bd0543855d061a7176c673364eacc130c568452c798e4a9045272af7df486c

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