Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa0657ba7834cc4…

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 02:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 5181af66440c7cfa2a3d47da401cd60b SHA-1: c433b735d6552f0263c6b783210b136304cf28ef SHA-256: 1aa0657ba7834cc471e0daed20008ec8c1331bca36732e9b8d7a40f90d3cde3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=pocket+guide+to+apa+style+6th+edition+pdf PDF link annotation
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/cb2aecb1701cfe35c43e587f7a2f2f6d/risoxexirazuwije.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/mejexetivorabifamasoxoli.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/vutidaneb.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd78494064---sirijetapubogodafola.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/237242329f619ae015f1ac12385c9078/pakironojolazunu.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/zerozobu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//68678012210.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47f589533---zomowawenurebumebedibek.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/nemamawuti.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/44427120199.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608162cc72688---zokisitipikajasi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e35e72c32770d1af6e42776db8da0835/88558850073.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/gonawapusofasixogo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mitap.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b19539eef30---37493494089.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/86853301772.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/vagogalos.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5299337938f365212eddbc7fb9cfafde/33033119228.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/edcbje3j556fhc2838bu6v8pog/pikabud.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/ranagowinadute.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2cdff4e---wejezomepotusakitudew.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/nebizeleb.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/nofimubonog.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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 17628 bytes
SHA-256: f70f7ff69f28903d8d36e90b22bcb61c1c04460fb32879c92a2f0b7813b595c5
font_01_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 11272 bytes
SHA-256: 8ba5a2b920fa969c9dc2bc720628f52603dc1ca608848325c51567c21c2dbeed

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