Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0c53573a34188d…

MALICIOUS

PDF

98.3 KB Created: 2021-07-21 00:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 938ec58f6f2383c2b0ff6eddea858a75 SHA-1: 4861e2b44bfa4521ce9de99297a2db4eb267f143 SHA-256: 7b0c53573a34188d445977f5da2139c266a526721337adc931a9332923e1c5f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7e98a67d---giluwewiloxugifi.pdf In PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ff43853860d23eba3e7ea7d8a13afe3e/jawukunibo.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/wavewejilozojasomulatadu.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c84318c1---zosor.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/28071355541.pdfIn PDF document text
    • http://schubert-hh.de/image/file/savuga.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/76eaaafcd52f4abb918593430ead6aa9/xosukoli.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094782817783---kosumakemirurebabarizigu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/35lpfsuep7os7bp6hd462fod61/mabebesadopurixinemikumo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3fb04c4040a74d534222c0c2b7968cf2/banegapedipabemorifemunop.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/diredebetoziv.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/65264918415.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1bfabe9a---zuxikeson.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/tejigusilez.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9a23b0fddadef19600254adb0f69e972/7202478793.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083589f8827e---folara.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/91774178931.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210704015716.pdfIn PDF document text
    • https://activepymes.com/pub/file/fonub.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb1005a9db---vewojasoxoruv.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/34dclpm3ul24iqpbo5gthdneib/35445484070.pdfIn PDF document text
    • https://wineart.online/userfiles/file/24561711388.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/16517500202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=spinning+wheel+sitePDF 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_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 18456 bytes
SHA-256: a3cbe84f11dbd1da00ff7596800873e90ca7204071e28d109336b684f9dc7826
font_02_sfnt_off00014c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8C 10308 bytes
SHA-256: 49a0825eea4774ddb8949ab2d330f2eef38e4ea87f261e3f46f37096031418fb
font_03_sfnt_off000163c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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