Malicious PDF — malware analysis report

Static analysis result for SHA-256 1672bd5ae76cf676…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 17:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ee71edf78f2b2a820010308839827982 SHA-1: b7836d5077b4138fb3ae3d8d8818c9a5c086d312 SHA-256: 1672bd5ae76cf6763bb2b80cd24106f7301eb33f1f2983a8b191c7c5b938f3dd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2af94e096---20185060704.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/5647fc282d537dda0b05b9991011710d/javidefebazuniv.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/42953372540.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/9chmiv3sk79f55j6tlbvrmmigj/28539661740.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/vupuwubefugalibuzumodazan.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/nanideboj.pdfIn PDF document text
    • http://usagimatur.com/files/others/28872546616.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/10991580402.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/3lvuc8epi1k520rqmedjb9mds8/6640023872.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607435168e6cd---lirubuzaravim.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7bad3e9ce6b697c01b2f3e5771e9f196/dobokizomamof.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/52582073491.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/413ee3c96b1b2f8b2cec3a29eaba0391/28268915553.pdfIn PDF document text
    • https://bursac.net/userfiles/file/venipar.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1tm531u72kchpu8c8ruar3nc47/jinuremazexoxuvura.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08333cf1e---sobinagaviwol.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00e622802c---4630518305.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/74850361166.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d632f4e7aed---kesawumafuzuzinofotu.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210526122711_116234181.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/47358589065.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b092122ee52---pexubedojolozepefapamapap.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd53669bec---voxewuwejopojo.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/77209687282.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/lofozozimokipulirij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=arithmetic+sequence+problems+pdfPDF 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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 11092 bytes
SHA-256: 82fd602f19fadbaa2b4b0408161c91adf55dcdd221f144281e3926e9f6938164
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 17864 bytes
SHA-256: 6258250d4c0ee6607b9e3594f0488b125ae71e447822c0835bd959f43a550724
font_02_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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