Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac8bffc50ca67a3…

MALICIOUS

PDF

151.9 KB Created: 2021-07-04 02:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: da45bd2bffd3cae4baafa1841dbab66e SHA-1: 54e11cabf37184a370fff6d643c39e130f1f33ab SHA-256: 1ac8bffc50ca67a3640642f211c093522694c1ea4fe623be3807558253d29a91
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c95db1dd628---pafabogedozulegawesalivef.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7bf8a61ee---jepip.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2f658eff1d4f3cd001b44ffe0120e513/99613076360.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/rizonuxumevusixap.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f843213beb1fffb831a72c4f227a0251/69136530004.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae34725d2---fasuwisirafanirad.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd91326d0---29258082545.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/92668647898.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdf220a13d---14224163390.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e58f9c398b4d4a81d0e26c78f77dade4/90067654209.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/pofogetofetuwaxom.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf10f2652---xiwaxugixeperigi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4d32435f08fd02dd11d59f739b5b695d/vowabas.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/talokuzanukiradake.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33ababe218bdd718a29084730b99db25/weluloxewesakosoru.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/zuseno.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/rapupijoroduzewarutorunov.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wejexovojozeduvaz.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/frluovn8le23m1dkh9odhku2q7/bupirilofiwevurenixup.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0m29jo7jn2coc5q9svdsf73j74/fukunisakimanomevu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/86ef067e36bc4c3f37508beaa897dcd3/wabawapulij.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/rorigudawaxojo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a1ae23cb5---roganawitisale.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/puzulir.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb67e3f5f---98520710270.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160846e6a95d26---tufakolipopowot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=snes+roms+android+downloadPDF 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_off0001f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F33C 10472 bytes
SHA-256: 142a2ef4dbe450b5da0b1e289e7f5afb723e03c6d1ae131bc16758cf7421f6ed
font_01_sfnt_off00020afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AFD 18152 bytes
SHA-256: 334bc2195ba6db7765c429d422e3b08d08965286f9fd7553d06de3205306a3e7
font_02_sfnt_off00023855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1