Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d27c7376af93bff…

MALICIOUS

PDF

98.4 KB Created: 2021-08-26 01:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8800130b0cef53276fec1ee07ff66460 SHA-1: 81ac5954a267ca67d8fe7e6fb37a1811c0861764 SHA-256: 4d27c7376af93bff9f0bd5318537131257a8d7c57825ae4af779eb68381bf0cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, including compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and link farm heuristics strongly indicates the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://drafthe.ru/uplcv?utm_term=homily+for+palm+sunday+2021 PDF link annotation
    • http://bahtiyardishekimi.com/fckfiles/file/junigegobezi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f4da5543---xenavubifivowenizamep.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/suxakixiwepa.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/dejenegoredotogujamonaru.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/zusomiluwipipugedilo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fadef4e59447aba9c8544a8991fbbc1f/56898317605.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1298c6f9e1b5c132d204f8ea9a323973/tifupotajorabajazusi.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210702164704.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/gusikepebevibexav.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/5ufuu59i4n5nh007uao0b5l327/jewidexix.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/38125508888.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/efp9vknsm8617qc5d01divol91/xadeluliwas.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/164394409.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///46616536221.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/92f128eb255d672aacf0e1c2e8f33baa/49549582538.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/potoxasekevexov.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/74644688450.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d2d6d7ebf---66810050897.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e8552431---69219874347.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04fc6e888e---wifawexubefuzugadefobe.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/57800353112.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/telonepix.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/00203be6a7ccf31200d4df5a88b0450c/lixexilakerogirasiduwig.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/7262771904.pdfIn PDF document text
    • 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_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 16768 bytes
SHA-256: 2a22863e317f2236613fdfcc2853a603f250916633341331144530f61166b0f0
font_01_sfnt_off00014ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADE 10928 bytes
SHA-256: cc7c3b8486de17a7d7397642b1362adc32a10fc7bb627e583869beee2c443057
font_02_sfnt_off00016421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1