Malicious PDF — malware analysis report

Static analysis result for SHA-256 5823cd19c831a142…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 18:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe8b9e8dd46b21f940f1e7ad06e415cf SHA-1: 84ff54983807aa2bfb432ede1df3a97e1713d4f2 SHA-256: 5823cd19c831a1423e96e5fb52905b5efe04865957c4b848cb16e1366fed2309
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing multiple links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number in a deceptive context. While no scripts were extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.andreapondika.cz/file/puwudi.pdf In PDF document text
    • http://transgusto.ch/userfiles/file/62537474583.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wawirisaboxugapos.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131487aee8b1---38289613775.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a0f38743c---81096851272.pdfIn PDF document text
    • https://emenu.hu/editor_up/62496886578.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/81601420445.pdfIn PDF document text
    • http://nanopena.cz/upload/file/gibepe.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/jebira.pdfIn PDF document text
    • https://gornjastubica.hr/files/zijazogofafaxigejapu.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/movitupaseto.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bcc9e53fe7f5d7719f30137236e466be/89729339121.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/12288158735.pdfIn PDF document text
    • https://mmtours.si/uploads/zigewaliwuzufuvotudum.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca940978b0b228deae01363ca08fe5f1/37252068093.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/98700239979.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89308758722.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/paninimususef.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a51cb237b6bb26750a7d33400e9ebbdb/livenerusil.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/35047319124.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/zadaw.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/19708942815.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/95868757496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=modern+combat+4+zero+hour+android+gameplayPDF 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_off0000c5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 16740 bytes
SHA-256: 3f25c0a45bbd720055c5b3f128dd6f80066d094f9bab7397173b124321b313d4
font_02_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 11280 bytes
SHA-256: 8216704f9c5deeb41495e459095a926cb1319aeacc1bfdc567bb276e59a9958d

Open this report in the interactive analyzer, or submit your own file for analysis.