Malicious PDF — malware analysis report

Static analysis result for SHA-256 de22a9187b559ac9…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 18:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b375b08876dead81097cebca3dd696e6 SHA-1: d667e2e25d6f6a0139147f7c22b71cf58ab13091 SHA-256: de22a9187b559ac9c0e314bda6ea9c52f0a6addd8abe695b4a6cb7500f8f4723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://ketchas.ru/uplcv?utm_term=among+us+free+mini+crewmate PDF link annotation
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/29955429061.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/danerijoxinaxasufa.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/42836056902.pdfIn PDF document text
    • http://autovoda.ru/upload/files/devebevuroxetaxab.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/30343905896.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4a0ccc1c482ffa1516fd1adcea432220/xowejomufaxulutusifuwadi.pdfIn PDF document text
    • http://www.bandungmesin.com/file/popowofonimamawe.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/186dbfca11bc3bd6bcd9402deb5fd0e6/kivimijapavikumo.pdfIn PDF document text
    • https://camelcarpet.org/d/files/nerigiwukudan.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/25615962113.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/ruwetip.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/jiwumenajomibag.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sg5ftvbjo06jdl5q9u1a8vv3t7/jidigupiwitarunez.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/31036784510.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210916233803.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/25304014589.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/30180643419.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc554f10bb---dagimokopotales.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/mebaludejuwasudapuj.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137128c7e1fe---5556078809.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/pawebebewagufivo.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gowitarulodifujak.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/aaf807404272786b346060379813ddf7/tuzipuvorawiselejuzoveta.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/91613711541.pdfIn PDF document text
    • http://hotelpancharatna.com/assets/userfiles/files/wozub.pdfIn PDF document text
    • https://superchills.com/userfiles/file/17269483941.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/12618206084.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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 15228 bytes
SHA-256: 715e97f481b029f1a1a6be821885939de752d32563c27bf563e4c892b321d716
font_02_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 10800 bytes
SHA-256: b41412f1f462fed5950e47997211d03607904ff569ce03f35da02244eccb014d

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