Malicious PDF — malware analysis report

Static analysis result for SHA-256 789f12437feef4a6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 22:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d85b531642a85ee216eebd436ee52a3b SHA-1: efc9bd68854eeaa40965f5268987fd80da484905 SHA-256: 789f12437feef4a6eae0c77393b48998c22aafb4c3848634ce4f9075d6363326
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qqliarsoan2g1j60j5nod67fm6/92816521641.pdf In PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/vavon.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/57455662120.pdfIn PDF document text
    • https://angkalaris.com/contents//files/sudenu.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/lepolumomopapewisolo.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/didajona.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/50726017567.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/23824866718.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ecbf516d0---67509395776.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/zedalijusilododumexexadiv.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/neladubowudik.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/medatepobobijovinisu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/9fa83bf7dd810c6757ddbeab1416a33c/zilerexo.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210616_FEE8C956DDC38C84.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/93457255970.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d8aac6fdd12608424e2fe294af3f8e10/29702875550.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2quuva0kll10c1bd9mk8g4at97/tipawivisuzose.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/68801329844.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jtphr7f3lip9aoimqambr6elb3/3245340543.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/legok.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9bn4o3a55v48ik98ai60h4hodc/74080923419.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c506f5cb---jabeleb.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/71448655972.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ef1e8b11---pedekudojavuzumobobilut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dopamina+pdf+bulaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 10404 bytes
SHA-256: 1e312b6246eee8023b1967341970ee4bc58969f98e12af9d301a6080b4933c0b
font_01_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 19316 bytes
SHA-256: 95e348ba10a7aebd840743a31801bf2f6c3748437dd37c39c5cf490be8327348

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