Malicious PDF — malware analysis report

Static analysis result for SHA-256 f734c9123f26237a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-11 16:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21d98dc57065823e38168d6b4700ab10 SHA-1: 4f419ede26d2e61df85595ca024dad59e598f4da SHA-256: f734c9123f26237ae0fe56fc40b9dc35e51e0dc895c96b1b6f886f955499193f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with URLs suggesting a lure for interview preparation materials. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=cracking+the+pm+interview+free+pdf PDF link annotation
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210907211625.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/40411735345.pdfIn PDF document text
    • http://zgic.ru/!upload/files/67142254175.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf2acbabf---21840962088.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/pesegakivanotedivosa.pdfIn PDF document text
    • http://nensi.si/upload/file/zomogobapokuxaveku.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/petelogevimezovul.pdfIn PDF document text
    • https://digireg.nz/upload/68406306111.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/93171800798.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/votewetarenekunanipojifin.pdfIn PDF document text
    • https://kimcert.org/E/file/20827769632.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613114048937e---kilixesebepagesifivire.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/sosowexezukiravivujijob.pdfIn PDF document text
    • https://svltv.in/userfiles/files/94428664457.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/14507497238.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/sodutupofagu.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/89829501241.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5af5a0434bf7314d14ce5573577ff440/diwuxipakiromalore.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf3551a17---mimalekesokel.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zejuzudelipe.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887fec3263---wilipajegukufe.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/tezodez.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/xofowavonadekowusifaf.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/28960037591.pdfIn PDF document text
    • 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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 14656 bytes
SHA-256: f472e77bd057f1a0b50bdb89205788fac96783b1df917472405c1361431c3bc6
font_01_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 11008 bytes
SHA-256: 6ed369be9e4cdd3514d030adc8a27446c4b89e36e872813bb78df238c65bd593
font_02_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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