Malicious PDF — malware analysis report

Static analysis result for SHA-256 0758a11dc2a60c92…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 10:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 897e26b5f70a6524f7c38ae467cebccf SHA-1: 9200b57a37ef0b9139bfd95ea1f050baf705af8e SHA-256: 0758a11dc2a60c926b21809aecc2a04049c54c876e51055bada518725614294b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further support the malicious nature of this file, likely used as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://staractivecollection.com/resimler/site/files/rigudofimetazorex.pdf In PDF document text
    • http://mopron.ru/upload/files/wodaxod.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/buxozonaxolawujenizika.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/57718932067.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/68398438955.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608933a83a51d---84887974575.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b59e6c767c6e87d5d73e133446ce50c2/badubibosi.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/3429072167.pdfIn PDF document text
    • https://digireg.nz/upload/94254538338.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/41705938452.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/77270874140.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/loramiduvufopedusi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937f9622a23---63535925056.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/87171080293.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/988a350ef9bb5913341b5884665275e1/wepari.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b9a68e2c---kubijimepodiwelifetoboku.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2b934b79---94055164391.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e8f9b07e---fomonivugemuwakogujav.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/678d020cae918458a6d921cabda45353/7293464273.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec417feeb92---duwalatizede.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607547f1dec49---kezajomusorip.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zirokonanivotix.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/43211eb3dc5d5444151c98762604f9e4/69696986707.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/zuxawiguvatiduxuneg.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2cd315fb6811fe866e96894f61a9c35c/xiwajogij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ten+things+you+should+know+about+transposable+elementsPDF link annotation
    • 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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 18976 bytes
SHA-256: b36275e1a525e8067c1740c6e1088deffe94c4849a43c10196b4ea4ae4ab3231
font_02_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 11336 bytes
SHA-256: 8fe3f8d904d4f8333cdd33367918347403b39ab732bde14e68407db3c5a2e8a3

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