Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaa8d46e65ba468…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 05:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee4be6aabf6faca4881cfa349636f89a SHA-1: 7ce05d182dda1a47f3b8f53141c01590ba19163a SHA-256: 5aaa8d46e65ba46876fd1dace51128ca06b54b13ead02d3058da768a949ee7a7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure and callback phishing indicators further support a malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eklyps.net/images/file/80721428026.pdf In PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/tononuxitan.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/70211036221.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/3022662340.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/zositudebidizefasenagudo.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/7396310421.pdfIn PDF document text
    • https://mbbs.hr/files/tipesa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6a81f715---66388794244.pdfIn PDF document text
    • https://akconta.com/uploads/files/sawodiz.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613759bcc4615---74618584577.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406f8fbb1b6---630933371.pdfIn PDF document text
    • https://nasikampung.info/contents/files/31705396607.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631717799.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ccmj4cpn0lhm39bom0jj5cq3o7/zibuxumebifojonexogasok.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614199bdb8f39---62912678298.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/mewedunididejazonuxozibuf.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/50602763022.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410dc5be468---57752237838.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/vokatufudomumigexowe.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/xipupogidav.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/42404465097.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/80466861741.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/tidetizanarubapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sniper+fury+download+apkPDF 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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 10692 bytes
SHA-256: dc94c815af51d98c492929dec3f799c1f990500f5d2ea308c6d6bfa0e43db688
font_01_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 19340 bytes
SHA-256: 6e026ece0e987c37e6df6ac537fb931cce4cadf505756265ae116b926112e9b6
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1