Malicious PDF — malware analysis report

Static analysis result for SHA-256 42482fe8845143e2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 03:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: feeb7c0a87c0425067866d2ce7a2b2d9 SHA-1: 3a9ccd096e8a5484bdbd255e0e579fe3db8c8908 SHA-256: 42482fe8845143e26540c2c926d1331ce8484346c70c57fc2a09a45d1914d1ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious content. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=grammar+suffixes+worksheet PDF link annotation
    • http://frutapacargentina.com/ckfinder/userfiles/files/12615202756.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/vemukikixafuvulupoxini.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d23fe19f67e---xawetari.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b1a30da595e95bcf60b04a10675ad015/71123797900.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58a9afe70---14935139128.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/jitidaxojadixojo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/12975863760.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p9dmc232v0bcqvi182po23dt32/toxukopope.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/3472427408.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/teribobusemexig.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/furitaromumasixoxag.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/57059724628.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/miribugowim.pdfIn PDF document text
    • http://dc-dcc6a74f5368.loveparty.ch/ckfinder/userfiles/files/26820318104.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073129c3e3ba---3284425158.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/87584593705.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0c89155547---bepixesipuburipajusud.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/gadekagize.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/satowobegibo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5801907d25---64881686668.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb1ce13c3---rezodepitemi.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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10748 bytes
SHA-256: 949a9fb199108fcec0d4a68b6efd454fd6a9522ee298aa2551d4ce4b37964c5f
font_02_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 17936 bytes
SHA-256: bb448fec8d21eaa276bd69634f0579a4059e39d8dd2b16e4396705910cb174b1

Open this report in the interactive analyzer, or submit your own file for analysis.