Malicious PDF — malware analysis report

Static analysis result for SHA-256 7672b39c48d7aa0f…

MALICIOUS

PDF

68.3 KB Created: 2021-10-02 16:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb3b2945189bd3e76766a8637848b77d SHA-1: 15d5ae5aa767e220d193a483e94ff48b1eb07979 SHA-256: 7672b39c48d7aa0f8bd33a3e7c4a7df362cb3f9017507222a44652f9bf0e715e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of exploitation techniques to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://crewmak.ru/uplcv?utm_term=after+series+free+pdf PDF link annotation
    • https://fishuntpesca.it/file/suviwipuxirafimevopurifu.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/wopakojefuzilumomomipubi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee76ab184---benekalodonotudod.pdfIn PDF document text
    • https://posh.hr/files/zunusobiwujegazobivu.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/sabosalinexujenobawapo.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/soxatagosumuki.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sejodaxofajefu.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/xeburigagenel.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615740b862650---30678755605.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/14516033793.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/87200046429.pdfIn PDF document text
    • https://proxus.nl/file/kodazibanemevure.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/figabivuvizejepijizujoso.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xolozize.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/98155778352.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16153dc946f2c5---dobiloxidu.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/5438542801.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/32675733816.pdfIn PDF document text
    • http://blueyee.com/upload/file/160503068185.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/82278685469.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/napamilajukepad.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/logufetozemogadam.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/33871189437.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_off0000ae96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE96 10040 bytes
SHA-256: 2e945758e84c7551dc8c4bf9a9a05d240342c38c4a74132e6078e25f66a49627
font_01_sfnt_off0000c505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC505 15436 bytes
SHA-256: fe9b0d46db134a98d8d0cee792672885d42f2dac14d39ceade3e8214eac3655c
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1