Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a1bb22a88dc7d8…

MALICIOUS

PDF

78.5 KB Created: 2021-08-18 04:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0c90bb747fd5a4dd702289f92ec14c8 SHA-1: f0a9f624ba91cfd944641b221c8ad13114194404 SHA-256: 70a1bb22a88dc7d8cc56563d1f0c3a7a393b0ae0575293dfc63482ecfa39af78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs on compromised WordPress sites and disposable domains, likely to distribute malware or conduct phishing. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cba01e777---naverebizinarud.pdf In PDF document text
    • http://klawiatury-foliowe.pl/_data/file/73890561185.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/vakepi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607f181cac524---75522498965.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210528_094633.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fdd448ac71---83949107432.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/g7bp0ocsgpn7ipslaglck24fhi/3586635973.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/bidasufam.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1015490df---dedanabojemugamewokuxatex.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/52669969971.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8deb8266---31319781247.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/zafumovararalovuruvo.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/kawosibolasivobe.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ea69713a4f710c48570929ba2cbba6cf/31386062893.pdfIn PDF document text
    • https://ebooksweb.net/files/file/sazewupazotexaxoti.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/7389335707.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/535ce0c5509d21b1eaf4689ad60b9409/fugoxunekufuxawug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a451e668f---17614070663.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b575b0a876---86677493982.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/jibukumozovebej.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1625835845.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46080005cd---86313591065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gangster+los+santos+download+apkpurePDF 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_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 16420 bytes
SHA-256: aaedc73e7ea4bb02964c6bd3698da59bb136de17bad3cd6e5246545bc47311da
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 10792 bytes
SHA-256: 07543a2cae20354ab29d9bcf92b98b68f70ff8939ce7abb76d171d9315d896c9
font_02_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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