Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a26afec8acb3af5…

MALICIOUS

PDF

86.8 KB Created: 2021-09-11 12:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf8dad8f98f4d3b08a2ce010cddf6268 SHA-1: 7967ddc49d5cebd86dcdea4fd7ad63e435404a44 SHA-256: 5a26afec8acb3af54cd8d152af77a1233bfc1c5d411122201fe24a2b83be29f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • 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://olterus.com/contents/files/xilivokopem.pdf In PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210910_4BAEB013415E5365.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a942e865c3---memodowetado.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5009a174de452f86697ef98b29f462d5/47685647958.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/veditagufevidopudido.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/80614732691.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/venokerometifejusukanek.pdfIn PDF document text
    • https://andhimazhai.com/images/files/81468131523.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/bawexamupob.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/figugapotilulesepafiwapa.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/96873974252.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109062248460511.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/87214410774.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/38583678116.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/rawogowoxonojekotusugajo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/cjp3a6r9higgkjju4275n3numn/murafenunodotepo.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090612364973499.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/80952951786.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/61754609274.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/gezuwodibogigaxapi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/afe5088081376d1a5754565a9761c7fd/78401463838.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109090800208163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+upgrade+the+android+version+of+a+phonePDF 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_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 18180 bytes
SHA-256: 276f9a134f8db33465bf00ff2bf3d37ef17fdc7ffed8606bd190584552f48695
font_01_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 10972 bytes
SHA-256: f74802bc7ca818bb64a2af66b1eebe93296369dba383d0dc970bae507f588f68
font_02_sfnt_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1