Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7d9fa7e3b257da…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 11:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f14b1280263b4750ff391a8855e9cc07 SHA-1: a33292b92e9252bfb27c18e5f500fbd42a15ade5 SHA-256: 4a7d9fa7e3b257daa67cb1201413eaae1b76d3b8ae34442b3e0188c67696a46c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it contains links to a compromised WordPress site, suggesting it's part of a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics point towards a spearphishing attachment attack pattern, likely leading to a second-stage payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pgj166cacolqjfrqoqtjdvl9u0/90272613401.pdf In PDF document text
    • http://tencanpowder.com/d/files/99103021086.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/43293365454.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84aee8124---17130077617.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d52a74f046d---gozuzuzafopatepuludosopi.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/xolujiradolonunusotukivem.pdfIn PDF document text
    • http://iltorg.ru/upload/file/58153477199.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/15165069231.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c862e6f1fb030bd6ac47ab81795559a0/lebejenugewu.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/81138235952.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/zupizojip.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/39015160841.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/3917154877.pdfIn PDF document text
    • http://malifer.hu/upload/file/tarigetez.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a4cb73d4---26834431580.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8d5e3cd2570f75cd7c04bf0ddd2aec60/gezepa.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/1rusmpro98m5mbvmpi8qsbhjtg/diwujutogiforipi.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/7cba04b207bbb80f75a500dd86bacae8/linoxukufuxe.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/91219396637.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/51247885900.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/1kci59rbob0kho6fmd9bgt9n8t/pabefewowa.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/97817760194.pdfIn PDF document text
    • http://614move.com/clients/4890/File/vogejegunixadu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f980ed6748---pudirebi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3de4d63635---belogemijemutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=keithley+2100+digital+multimeter+manualPDF 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_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 18368 bytes
SHA-256: 1471025a86091eac250e408ae066af7a39f66413b0076cd2bb97271e35c0f6be
font_02_sfnt_off000137d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D7 10904 bytes
SHA-256: a65896bec9dc936f575531b07a425238416f8cadba7e4908c1cdf4d063052fc1

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