Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dc0b893c9b66ae…

MALICIOUS

PDF

91.6 KB Created: 2021-07-29 17:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fb89481de84de5eb2a6b084ea60f1f28 SHA-1: 2ef7b1cf8d34e9aa36e88e5451f2d79936c04232 SHA-256: 87dc0b893c9b66ae18beca33fa19d792ed724c448e63c7d46e15a370fce2523d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/9e3c9750a598fc9d004fa525d2630e75/57933393414.pdf In PDF document text
    • https://davaocarrental.com/images/file/pesilarabakexifu.pdfIn PDF document text
    • https://drlanda.hu/user/file/37830963283.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lugutukeju.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072be76a1ed4---38277848006.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/39002444834.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f0ca0df1c9efa20497a39c86362bb569/15519468986.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081908fdb9e5---69705013480.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/57858912578.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f45a1269c6988b1c708d14ef39df5012/48696912229.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/junikivopavurawofigin.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e38929f4---wogexezoxov.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/74896586905.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/50832329085.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c1a3ca9c4e---jiduwuvobexisovunimijofo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa26a7606---12291290509.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/sorexor.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/ca318c67bd3ff00349c7826874b03b0c/gafonubedugasezojikubika.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608728b5c429e---12130922099.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a8bbab3c---42734626939.pdfIn PDF document text
    • https://red-adlay.com/upload/files/28935419073.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a202d3a324a---51776719034.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/rekaguzikuzovabinoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=why+is+my+brawl+stars+not+loadingPDF 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_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 10896 bytes
SHA-256: d8df24305c053ef4e5f9b94c44134ec37b21c15af60fb9bd065587a14a28387c
font_02_sfnt_off00013102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 17800 bytes
SHA-256: 70efc99b724849f4dae857bbbcad36f7bc84b65d76f0e46f9d3764ebdd80cdb0

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