Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c26e712bb14675…

MALICIOUS

PDF

86.3 KB Created: 2021-08-04 07:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2b048499c009262572104ef9da78e16b SHA-1: a4a8b4038d60f25d337e09ef669cbca968ecfd4f SHA-256: 83c26e712bb146753e70c7c2d4338131b7b9bd506c6174dac1a5bcda2a005ab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=best+buy+store+credit+card+approval+odds PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160814308d85d3---69469511608.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd94fb3114---goterafijanadovasun.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ec8fa5044---75707748099.pdfIn PDF document text
    • http://sasalidayanisma.org/uploads/file/xilabufuxofete.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/gaxovopakuwazopik.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/33870391731.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/55538795478.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/nuzizusebosowebigekumuru.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/58410104408.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xoniduwerajobipimo.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210713_045929.pdfIn PDF document text
    • https://peterdegendt.be/file/kimuboxufojizofe.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2dc7175e---javebexejumolovedef.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ddb32c39f4113cb18a0131455ae3253d/ribunerulodetaveduzote.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/19767867710.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d36654d4f---65890793922.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/p9qiu3ob07oqvn5pceijo8cf71/kexumurodeteweradozel.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1802cf0e---94072772301.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/15858930611.pdfIn PDF document text
    • http://446888.top/userfiles/file/15820681292.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/59211094085.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/palizibuno.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/terateraxixodunudoso.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f5fe4f68---1382882700.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_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 10876 bytes
SHA-256: 34dbfe41fde6fc1254153f5a620f8dd3e1db7e1b1acb2ead7c45f56ff30754df
font_01_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 17288 bytes
SHA-256: 07f6b6f5e84cd01e38d7ffa8c5298510ed7c1d1bc26f50199a20d4ef9fea7e83
font_02_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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