Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b6efcace1dd2e4…

MALICIOUS

PDF

88.7 KB Created: 2021-09-13 01:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a84ed76622e987a240a304d625ca3ab SHA-1: bf3113e4dbe10c7d18ea40c9efe105e9d657977e SHA-256: 12b6efcace1dd2e41943d9e9da787eef19d19821f768a15d68678c00772c4caa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of ClamAV detection and ML classification as malicious, along with heuristics indicating a 'link farm' and 'callback lure', strongly suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359cb3987db---jukaboguxoga.pdf In PDF document text
    • http://wwsm-us.com/files/file/zezobulixo.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/16744034221.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/nitukog.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/11314002684.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/89975677364.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/1670389329.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613219f5180c4---nabutamipufarotopijepedes.pdfIn PDF document text
    • http://thepducphat.com/upload/files/dusaxupefowuxozade.pdfIn PDF document text
    • https://network-italia.com/file/momexoxusadivo.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/vutidukudobupe.pdfIn PDF document text
    • https://southafricapools.com/contents/files/favefikafemomob.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/38886952858.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bcc2faa024601d488edb01f4c7f666fd/wanutisi.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/4395179049.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/48491087963.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/68035254485.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/datuvodewa.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613141a15246f---xusolubunitoged.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1979efff4cec70616e6b0de8875a28d0/vadudapuwipotitatobovudev.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/sovuzagotiwezovid.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/kamewujo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/agta3et67nhgo7tpthd8num3j0/kitonunafakivujujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=file+android_asset+webkit+htmlPDF 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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 20724 bytes
SHA-256: 26ceac3174fda5ee0909811ee514bba4f195da87c0af1c2557aa22f120ec9fd0
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 10840 bytes
SHA-256: 0d15a75665ac0c6fb5752181d6a730867635a3ec2f48f31d8c19b5c5b61692cf
font_02_sfnt_off00012664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00013bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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