Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1c3e78d674ad42…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 11:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7100d08cd36b41d09698f4db7b1d0f7 SHA-1: 436680ac749d71e24d57b914f7fd814946a7bbe8 SHA-256: ab1c3e78d674ad42f286fe18911013e0d3863a53311e02aa872b5502dfbf1fad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm characteristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://queure.ru/uplcv?utm_term=pneumatic+actuator+design+pdf PDF link annotation
    • http://zwickerfoto.hu/_user/file/fudesipabivosanalubo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/39b140080bf8eaba713439c5cc15e4f6/tekelewoveredibu.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9eb570f827236c61c215381edf9bb6a1/zuvidugijow.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9dc7cb3c5---21923708212.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/nugejubebefubifad.pdfIn PDF document text
    • http://moristas.com/userfiles/files/24899933943.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe24d44f9---40354541699.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1e07bedc2608c7eb45bdb4f19429f57f/91656935686.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a23b74187b96eef621071870a26eedc3/zonavosinabopalojudu.pdfIn PDF document text
    • http://jar-ted.pl/file/33932815468.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/zuzotisogapapujowisozid.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c02a488b758bcc07fea6ad526ec3703b/67283043714.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/basuw.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/79404418870.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2k04nvbu451uaeastiki8bp1if/72441676568.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/salamipasijibemo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f155a64a0d8---13367580460.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/boramosepisudafujuxosilu.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/51468296527.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/67453688721.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/39855389866.pdfIn PDF document text
    • http://canvangdientu.com/images/file/zataxukirupam.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169b59b710---26350670848.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/69788955880.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 16616 bytes
SHA-256: 011eac5a6146b2f3a32eb8a706809edb40ec9afce4baa561cf5f30efdc58842f
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1