Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7deea892a580647…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 06:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad720349e8c9c3a87c564b7e28619c84 SHA-1: 8690262e9161ee93690664598512d1663621613c SHA-256: a7deea892a580647fc095bb97866a06387f1f5d94231b2811f1432bca7a90c3f
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dongsachhanoi.com/webroot/img/files/92802994121.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/38g7cm7qjm43sfmhkct03subi3/mejadowesaxabute.pdfIn PDF document text
    • https://akemi.ro/hirek/file/vukejibevunoloxaselavew.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/03966793aa098452e42b025b810d43a5/51066029840.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/77906715737.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/pixugugokijifu.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/lepesorepidowoxopipox.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/26324689955.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/lepufujujirigu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160872c5826951---ximikajorikusinonoxa.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/86581059840.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/bodepenux.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gs7dt2q0s32dig2uus6bmfs006/10400845132.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b2sakp8s73j8h40mg46lohdsce/fumelorizu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e7a12a8bd---pezivozedujanagasulakixo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/52c94f4b6c4c8ce38fea01123c44bf54/digemonetumit.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122af94eb8---38916199487.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/leruwidunagoxo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d049c111dd---gopew.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070a56692300---rowagakogurofemamodi.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/56074979124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ncci+inc+experience+rating+worksheetPDF 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_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 10864 bytes
SHA-256: 28e9a79be8a8d57b407051b953f6d0d76cfaa1b399f4d8003e7307eb062058f2
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 17504 bytes
SHA-256: 7de1946fd0ecbf3ddf34069b1a2374afeb3a1e7e1b6d9cff9e7c089ec17bbe29
font_02_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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