Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac71afc0916cf04a…

MALICIOUS

PDF

89.1 KB Created: 2021-09-06 11:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9853e339e7ea27afa6d7b44ec032dca5 SHA-1: 6bbd8a1fdacb3b85d760d8fb7b7a7d60846ca2a9 SHA-256: ac71afc0916cf04ac9c620fdd44e921602803ef320cd8ef30cf9fed88664545d
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links, some pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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.
  • 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 http://kondicionery-ivanteevka.ru/upload_picture/file/sefolemuputujafilowa.pdf In PDF document text
    • http://zhengfutz.com/v15/Upload/file/202152720088345.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79e295135---tafebakofigiwamaselekigaw.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/16257515654.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/21370370742.pdfIn PDF document text
    • https://guanlai.tw/uploads//files/202108111431095021.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/xafaduzipugexuxebikiwa.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/8176791148.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/13447215092.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/55970821357.pdfIn PDF document text
    • https://go2germany.ru/files/file/87662795692.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/88174218204.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202108280927243812.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vsgqcr60e09bbnhsdq9mdk5ej6/63090049195.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/15852213896.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/16260375794.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/60295689536.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/66188129182.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20551665fe---75086336471.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca6e68976---96063199932.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/retaz.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/31404705033.pdfIn PDF document text
    • http://xfswchem.com/upload/files/zofegenupepiluralob.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8c4b0e05a17edce3614d04e75bcdad48/96386057175.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d23cdd90f---98159714771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+ph%E1%BA%A7n+m%E1%BB%81m+chuy%E1%BB%83n+%C4%91%E1%BB%95i+pdf+sang+wordPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 23208 bytes
SHA-256: 0a0a0e07891db249bda086ac98b30fbf35aadca8b01e069460467b32af007ae0
font_02_sfnt_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 12140 bytes
SHA-256: 3a5588316cbe66448d3fbac6977a46287177ea1951bc09ad6518e363e9dd4553
font_03_sfnt_off000132df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DF 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_04_sfnt_off00013b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B64 16684 bytes
SHA-256: 487f74a05ca2022a769b69e9dd145cde784d91493148dac494a5191ab119380b

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