Malicious PDF — malware analysis report

Static analysis result for SHA-256 69505bc5915b1583…

MALICIOUS

PDF

85.1 KB Created: 2021-07-14 07:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc004730c5d696686e079fe1a90fab80 SHA-1: ff0b43a09a7ec8b9143f7b6d290ead8ed44764b1 SHA-256: 69505bc5915b1583d07ca0936b36a2146006cc5ebb42d0dc554fb7f9e0fb85e1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan distribution attempt. The document contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms, suggesting an effort to obscure the true destination and evade detection. The presence of numerous external URIs and the 'SEO_DISPOSABLE_LINK_FARM' heuristic further support the conclusion that this file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ckmandarin.com/uploads/98921450181.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0fa90187565b7864f3fdc502492ee9c3/24611754302.pdf
    • https://scriptdd.com/_file/file/84404419303.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waxogutiman.pdf
    • http://kistours.hu/userfiles/file/lopaxisufelej.pdf
    • http://alnoorcity.com/userfiles/file/46028266313.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3df842b03---xonapofufumivugivimiw.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160852494ce00b---sosopisubegikulidabo.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/svrmrmuac3rej9pqu521sv7rgh/ramoje.pdf
    • http://okwecare.com/usr/userfiles/files/13863038988.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/jmjtnb4j9goc2e1tn19asjtbgb/vekuvanukufipo.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/kosivibowepaxobugemires.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1b5c9035---soweraparodarobix.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bc60c3a70d1a6d722c6ead1c298b395c/27360602409.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/17611880358.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ed6c730e2---99522218471.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/soqb477mlr3v7mtt0tm3klcmgq/14488945807.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e64e0d1d6f3---remanirixasowinifef.pdf
    • http://sakem.org/userfiles/files/vuloketo.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/7563495595.pdf
    • http://frezerovka.by/images/fxeditor/file/98167409393.pdf
    • https://familienarbeit3plus.ch/userfiles/files/patatefipaxumipevon.pdf
    • http://eva.am/files/5a2420a61167961d.pdf
    • http://hevolta.com/upload/file/xanejiwawafugef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=collier+county+florida+court+case+search
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 16792 bytes
font_01_sfnt_off000101d3.bin
2c7e5b7f11cc705192999cb485477299e13b2270118745fe27ff7407f4c40d63
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16852 bytes
font_02_sfnt_off00012e09.bin
c3ec756fd72c1f5c2ec8b2c461ecadaf3805ac5c13193551d9db279c17d8064d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 10820 bytes