Malicious PDF — malware analysis report

Static analysis result for SHA-256 998f6a7a5a90e010…

MALICIOUS

PDF

74.8 KB Created: 2021-08-11 03:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25940888798c25ca85b93c0678ec69e8 SHA-1: 396a3e0d0ee755dd73eb6677ec5d0b7f8a9fc96f SHA-256: 998f6a7a5a90e010b310dfb8e990966d34c48e6f21682bd5cdcd295be125ed89
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in these scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/8195095632.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6ece0b429f0074dac0fe6fc946ce540d/nikipur.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/podirawomizoxenufojitobaj.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2576910bf3626d272dc4817b63335deb/vurulevapivepimesomidaju.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af72a467ec7---86314852879.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/a84b2a8125a82531e1e6b1c6dddb932f/95626079873.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160862061258db---86632433911.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/eedd627cc2a9e51beaa0599698aa2f0e/25139986401.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086032e5d3a3---mukafalinorug.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b167f91b5bd---lupenutabumepebijoret.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/18720690181.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gtchsvr6ffcg9agvrmi283cal0/tofoludajovatosiriwebon.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///dofofetijebuvatizat.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/14339515665.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bs65ed3f7r6ntvsbbth0rerurc/zukavenar.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfd56d201---xanevuzawugorakewo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5cca7395---50958468048.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/nonikujozetiw.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/15301422207.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rusupapebosor.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/37194577285.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bscrbgcvi08q11rsm0nf8lnf9m/86519312270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=heartsaver+first+aid+answer+sheetPDF 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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16276 bytes
SHA-256: 9f47625719526c0b81292c87544664a176d404467aac0fec374dbab4c1750f84
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 10428 bytes
SHA-256: 64c4d20410fca07ee30bf8c37e4b93cc3f67538ff13e78e5322ac79c30c0706a

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