Malicious PDF — malware analysis report

Static analysis result for SHA-256 e973a14d4a5134ea…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 17:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25f7ea3a26fdfc2fd7b123c9d25c9b4a SHA-1: 25c708852c2167878d49c2ccc376c501d873dfd0 SHA-256: e973a14d4a5134ea4c0cd64e9a33ba246b32e8157f89daa22f5d62f61bd39eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links and the exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48ebc0c4b---3487957928.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab94719727---55081960335.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wopipesonebo.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/96452265979.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/pajilirojeriwa.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/12170840750.pdfIn PDF document text
    • http://derma-dts.de/files/file/wififanebezolewifobapoke.pdfIn PDF document text
    • https://davnosti.ru/upload/12436674984.pdfIn PDF document text
    • https://landbar.com/upload/files/48917590197.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/56062020684.pdfIn PDF document text
    • https://ovalpolycoats.com/media/labulodadavawexumug.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea077ac9---11974616774.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/85718712253.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/rezorokemureragakevagemun.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/xakexasesadijepaporo.pdfIn PDF document text
    • http://esejsc.com/upload/files/dojagasotasajisipujaj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609443ccca35f---nigovezenugominunis.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160904ec5063d1---49002080572.pdfIn PDF document text
    • http://armanetti.com/images/70198876057.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/98107784578.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/monemaxazuvag.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d4257552e---gaxinixevalejama.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/0r2jcr7fqtmdp3537ahju30od5/vusopes.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/wadurojap.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/39374312452.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44555209323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pentax+k1000+35mm+slr+film+camera+manualPDF 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_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 11152 bytes
SHA-256: 1b152ef75aafdfa74a07456d2e166aa0283c5fa8a09bb45d7f1ec213dee36edf
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 19100 bytes
SHA-256: 3ec3404a860c061502e894db9641aad515081fb6c4b084450afdfeeb725102c1

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