Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d842ac3906b49c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 12:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 371269aeb106a40373f535c37c6e1a6c SHA-1: 1067cafb9c8609e391f952d38f86131bddea733e SHA-256: 71d842ac3906b49cbdb58a6c4fa6db6500bae4dfecd1e7751ba5a784ed810da8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ghefoot.com/fckeditor_userfiles/file/62172492458.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947f654a35---93258224693.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/86222692521.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c51f611a12---4546880541.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/jafuwoselerezufizafivaset.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/tagoditomeloguzujawogujid.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/97540345517.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/jq6ffdjt2n89qrcfp90t307o32/81215481258.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210917_002016.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcbf09c61f---deforobobamubix.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5243abc911f989a708323db60d137f33/50125617992.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/63126158101.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/kafekekituxegen.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/83590391527.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///53347064699.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b1fe55abb38b0d553d5d2cf54bec597f/97326454075.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/selipivulizalupelitegi.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/nabawidopexugavaliwote.pdfIn PDF document text
    • http://wsm.hk/images/files/mijalamebevogotopagur.pdfIn PDF document text
    • https://ksuskalology.com/images/file/pilexuxenetugegojanat.pdfIn PDF document text
    • https://afayl.com/userfiles/file/75588006257.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/46992993671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=clipclaps+beta+apkPDF 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 22004 bytes
SHA-256: 61b6c8d73b2f47d1f88df68984e3c8fe00b4a105035bde1f4ae4addd86932c7c
font_02_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 10304 bytes
SHA-256: 88efbadb323eca8a7c9783325f1c8c38c7d234f8dd350cca416dbec6f1c42699