Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac625b286f9b954…

MALICIOUS

PDF

109.9 KB Created: 2021-08-17 20:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 2e4142510d27e96a6482a49450ea857e SHA-1: 8d30159508af8a84d0954555efcbd51b9d27a075 SHA-256: cac625b286f9b9548e72c41d5ecb5ec60222f9d037c4e61d42a62e7698f82f88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e37b4ebc---5468283787.pdf In PDF document text
    • https://synersys.fr/contenu/file/jolekozuvumuzaninafom.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/44377048770.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/51718542168.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa33506f3---20859217699.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fugerupuverimo.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/34361640302.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/pufotaluwaworododerafeze.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/baripaluregefiwame.pdfIn PDF document text
    • http://teakdeck.pl/files/file/xofawozadepep.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c09d3181---xubifaxevonogegemokotepub.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/49695618837.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/19096bc89d4f0078d99488ddeff843cf/23227531340.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/29c389c77580b16d73c2885e5147a309/sigetudepalena.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/52820537953.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/52592420406.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210520014526156.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/84137062064.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/35628070511.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/nuzuganixufiruxonuwibux.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/98244918415.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pohgpca416frpi7pbapmeact55/xedavokexugujazam.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/82688905630.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160740dd275820---81111562167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+type+of+intermolecular+forces+does+hf+havePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_01_sfnt_off0001458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 18736 bytes
SHA-256: 828e00572100ab0e2331fd5b16abbf8b8d05687e8f9dc0eaa34cf6a0a06d6e2e
font_02_sfnt_off00017751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F68 11156 bytes
SHA-256: 4ea8781e6a996ee0e220339b695d8c1de660418c38f5ab931033f18fdb8052e1