Malicious PDF — malware analysis report

Static analysis result for SHA-256 05abe4ec0e9da0b6…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 01:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26299da9887a2f93a00d180e8570a5ac SHA-1: a46f11417e484af146335635b08244a81bf05aca SHA-256: 05abe4ec0e9da0b665e6d169f99311ef114ed4ddc0c00418ec2fea92d1f94b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://queure.ru/uplcv?utm_term=cognitive+learning+styles+pdf
    • https://dolmalatrek.com/userfiles/file/divigolume.pdf
    • http://www.findvoters.com/userfiles/file/xotigosixa.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9bb8aef47e226c962916b90142a52eda/magubobonozonimabuvu.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a75982c27---27322374313.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa130b2a30---kisarovizo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qub9orv3c6k3l25bv2j6ptc2q7/77258582727.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cb67691d---91476352554.pdf
    • http://cementfeet.com/userfiles/file/47025289096.pdf
    • https://afayl.com/userfiles/file/33201629584.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9db31e4f---76932274263.pdf
    • http://asustainable.com/global/file/88169734649.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/875e1fd0050f6c1fd0ee25e18ee37ce4/9429659556.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d7282c98---gapurezulanivekos.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c956ef99d57---92144979826.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5873418c8ed38aa9857726c19c528cab/vegevudugilobifuwo.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6c54e0b4---tekoto.pdf
    • http://global-insurance-broker.de/downloads/53596636343.pdf
    • http://bmcnx.com/userfiles/file/mosonixojaxezekodatunataj.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oj857r593rhbcv2hadjecnb3ms/16918608594.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/12cd0f1c7cd84cf54aa89e6c2c915ccd/5559800721.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cce9e40ff24e2114c54ceb2de075b11a/pebesafobipuputazek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609669770d2fa---10302816260.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fipgdjt5q36sji22g5lt2sf71j/32354739100.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/p02hm4830tdbfdh72snuguitgs/megezominegojatu.pdf
    • https://kodcomputers.ro/2664/uploads/43165913903.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832b6497b07---33336033059.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/80e161a80428f40aa7d2da4aa9cd7cee/kedivovesuvo.pdf
    • 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_off0000ec24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 16792 bytes
font_01_sfnt_off00010436.bin
08112590ab68e5bf995628174eefed5ab99275e58a46683223653538ff0c5c22
pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16904 bytes
font_02_sfnt_off00012f84.bin
b18e919cd26a4d725608b0a47e215139897ea89a76fe5090ee5964cfc4e8f9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F84 10884 bytes