Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c0e9b454fcc5fa…

MALICIOUS

PDF

100.6 KB Created: 2021-07-21 11:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d81938946a5798502b4f642ba87b4cf9 SHA-1: 32bb0c902b89c1e1a09158a4a0a5a0826666a425 SHA-256: b8c0e9b454fcc5fafc1e9ba178e9a5f1e1d18ed0caa664e62eb33554535aed69
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa5dc389b---46710837493.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ooj3ecpsj34bfpjij1nbmm0j01/33192422011.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607916c8c8646---50108723953.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce121cd2c0---83700797169.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/naxinivajilemijeb.pdfIn PDF document text
    • https://soechi.com/userfiles/file/62868629735.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/44364511380.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada5619b982---kikujozajawurikuwoz.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/034d9c921ef60387e654a97852593c06/xuvokuduwigugaxulumi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/saderojufugidad.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/98260197672.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/puzefowur.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ej3fs8vdci4jikfjrrgscb0sg1/jonagebefefurolimuxir.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/pivulonam.pdfIn PDF document text
    • http://goref.ru/files/file/rewitovomunevoxigodaf.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/57763256886.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d73c6fe0dd4bb0a340b61eaad23c8dd6/belutorajojofojexiwaf.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/45396570491.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/6b0feff71c139532711fa2b9d4cd4db2/gafelapiluwukaxe.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e57e6c430636bcd82148a7a5b7d208cd/nufoderowiz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22355cd3b8---38338736839.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/122fea658a4b0f2661d5f0ce84dd35c4/50981772523.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/55772490c635598964104a8a5d0856c7/98567729494.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/1k9pmr79j72bhlejhhf7hup8uj/kunogekatepaxames.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/91663408778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+french+protestantPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 17712 bytes
SHA-256: f59260d51607189fb88edab5aa8da7f20e350a399a66714327b1033f40907e3d
font_01_sfnt_off00013fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDC 10420 bytes
SHA-256: d9734785b77feb677878f8599e6e1f97725da733c86fb99fd34589d62f8f6887
font_02_sfnt_off00015774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F85 16108 bytes
SHA-256: 9ea9197b6a75c7fe67a727ea228f5add925cef9a7182c4c37535d81b948c8910

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