Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e81de69234b83c8…

MALICIOUS

PDF

90.9 KB Created: 2021-09-06 17:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64bafb57acf740ad579a2a66e99b10a4 SHA-1: 96702a5f72a7af4192e9979229454069d03e75e0 SHA-256: 8e81de69234b83c8a10bc6e5e571d81f3285a8ee5be3324e460c500c422ba96e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect the user to malicious content, likely leveraging T1059.007 if any embedded JavaScript is present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=nihilism+seraphim+rose+pdf PDF link annotation
    • http://101-games.ru/images/uploads/files/85467038315.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/ginuvitobizoxojuxa.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b92dd2faad46547c8f60785bcd096808/xavurumolapoxi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/605f9fc570715a11ca491043f31921b7/49609144781.pdfIn PDF document text
    • https://ivanamihic.com//files/sonikagupaxututesese.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e9827cbbc512316d5c2ac8dace232ca5/pikunozomigowofo.pdfIn PDF document text
    • http://clingac.com/d/files/71447994293.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a372d46b5---monavaliko.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d7908eaec---geziwixokoxebitikix.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/28196209880.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/20912725102.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/94968484922.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/wexejemifonebav.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/luvezagebepegu.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/42314603108.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/xovowunekumako.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210609035754_tncf1f.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a229b31853f---futagepop.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/vekokegagusubakoxuvapugab.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/vifurilutoberosapowomezez.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/27b27f6734ba0f42aa55ebb6357029c5/79061094646.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/dogiliralo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2f30aecc---vefigulimototakumelefoka.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_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 10536 bytes
SHA-256: 7e334781c344e20a73ec35d21c3e94d5f522f5332d3b5acbf70094a8c1f4e501
font_02_sfnt_off00012df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF8 18528 bytes
SHA-256: f4699b15c5c6ad0c5834970c15aa3d4e7dee89269108eefa93efc6676a6f9791

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