Malicious PDF — malware analysis report

Static analysis result for SHA-256 1619257812d905e8…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dbbc26ef8caf73c726f60595ceb55944 SHA-1: 1d30b33cd3f3ecd5fa09402fd74cf86863aca258 SHA-256: 1619257812d905e81ac1355d7f9cf089b196624df043420a49595c0288f0bba1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads and disposable domains. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=redmi+note+8+pro+genshin PDF link annotation
    • http://chromoink.com/updates/file/65286629116.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/mupezeralojatesi.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/pixajizelesoxoje.pdfIn PDF document text
    • http://naviway.su/upload/files/liloxelebidibesub.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/17876061938.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/24608099077.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/49932023660.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/livabulakerutajeg.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/32825387946.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/labagilevumuwuvog.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/35187730713.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lemisenip.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5aa79dd54102cef16c691945e5c21ec1/vuzugenegokatipomegej.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c9e6b6b35---31969534578.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16150496f8c3d4---xokulefukugulud.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/94562528462.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/80757387540.pdfIn PDF document text
    • http://riversedgefm.com/files/file/gulatanonewuponiwizo.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/zigemevumimilus.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/37572052774.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210907050348016.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/pepojaxa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3fbd5de8---49178947842.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/14807843382.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/dewowigegixikeliwejavix.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 18024 bytes
SHA-256: 317e1cc3fe84ebca22f7620de2c0645ac67852c2582f4448397d8f4b88dbf5bd
font_02_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 10884 bytes
SHA-256: 9eb94705837f065aa10d9737e40380f3b83ab80d5f2912b820ae40e9f39c93ef

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