Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab778e7d666d1651…

MALICIOUS

PDF

92.1 KB Created: 2021-09-20 11:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54deae9e719dc8ffe0706ec8f45995f3 SHA-1: f39a8bb687bb69dabc7c292aaf0dd45f37f3ccb6 SHA-256: ab778e7d666d1651c07be4e48dd49e39f74563d0310c7e4e76b5a710a376d2f6
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161340bc473580---zakalebe.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613558aa03a5e---bibixexavilawe.pdf
    • http://studiovalentini.eu/userfiles/files/puxerifiduzejisurumiguj.pdf
    • http://zlzljc.com/uploadfile/file///2021090408170755.pdf
    • http://honda-vo.com/upload/file/85898730041.pdf
    • http://aurora-c.jp/files/files/85678695676.pdf
    • http://rococosofa.com/files/files/92880164372.pdf
    • https://nslogisticservice.com/userfiles/files/8428079169.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1b5c4fbb---45111747275.pdf
    • https://ganganagardentist.com/userfiles/file/25339012283.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/lemekifepadut.pdf
    • http://genarchi.com/data/temp/file/nizix.pdf
    • http://gniortho.com/files/Upload/file/niwenutogujexoruxit.pdf
    • https://questyme.com/userfiles/file/mumukigewimuket.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f688634d1cc39b879c7ad029fb5087e/bigezakonobune.pdf
    • https://sankaibearing.com/userfiles/files/fikozilifesimepubomujul.pdf
    • https://km2804.com/ckupload/files/dugixivijubub.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134146a0f2f2---35950776978.pdf
    • http://reclameindex.nl/images/uploads/61756800819.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/xujikotepurizuvajelas.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/9180476791.pdf
    • http://optykglowacki.pl/obrazki/files/mitodejururimunemi.pdf
    • http://odumakus.com/uploads/files/dapipekaniwunulamewu.pdf
    • https://luatsuavina.com/userfiles/file/bapex.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93c0a0727---didekun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+cartoon+online+tv+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001041d.bin
5a484e78afd768470f230cb6f1a4d4f5ee29d065c41a33600f22d581c3bb7bba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 18080 bytes
font_01_sfnt_off000132c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 16792 bytes
font_02_sfnt_off00014ad8.bin
388db82c4c017b9d84e8998ba9dcba3125c21789554d66e33c921e11157b431f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD8 10456 bytes