Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d14bcfce4bb50c4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 17:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20e6b8dfc2847c9b8724082ec8c31fd9 SHA-1: 7780e048b5ff983bc1c65072f59671cf53233b56 SHA-256: 8d14bcfce4bb50c4e04693f9aaa36ee927b79cfc5f23b59801493658bab5945e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cnokorea.com/userfiles/file/dapijasategegumara.pdf In PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vurevodabatabegonarap.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/10989857939.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/46689933851.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/23286696941.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/xuvokig.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c07e3dbb5---89273406321.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/66b65e5b89f8feeaeaa97fd6c2df51fd/50645830174.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/50643468885.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/pevufodulenavovi.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_2E8B3E5CC27DADC4.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/98774073332.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/djmpituiid4d9m6072crf2mtd6/jewivomalowavesuril.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/97042592852.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/biwaresudinag.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/jawojewevoxamefidok.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/45906891897.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210912095828.pdfIn PDF document text
    • https://grouptm2.com/contents/files/76118979946.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/zeniloxevikuvaki.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/82332809237.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/50426145237.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/bujixagoxawivok.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c4fe3b8525e91deb605d7ae61b05e244/84589126125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=back+to+the+future+part+2+watch+online+freePDF 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_off0000d196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD196 17976 bytes
SHA-256: f5ff50391d6981e6ac88c5be4e19fbec4ff48c6b2088dea1ad9299d4e571944a
font_01_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 10860 bytes
SHA-256: 6e30492000fd00582faee288356381a4a825dd43754d6d98c588f384d8eca6ef
font_02_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1