Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e6815994dd0db8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 22:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 291a026bb5e52af0ebb3a13a9a358247 SHA-1: ba7bc76d359c28aa77045901d31e3a87361b30fd SHA-256: a9e6815994dd0db8b510a97ba965a59ad39ddfeb8545ebbb7701f31785a19c86
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://awlights.com/wp-content/plugins/super-forms/uploads/php/files/439d8f3618b7d86009e343d4553cc05c/ributavijubamiv.pdf In PDF document text
    • https://stillwaiting.org/userfiles/file/62433152022.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tirilerosogozipoxula.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/83381694729.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nuxefedutibadodebivuzasa.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/68447297985.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8580c6a333---morefegubekaxedura.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/84033440519.pdfIn PDF document text
    • http://446888.top/userfiles/file/betebafebilover.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/27670471010.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e2b6a432---xoviru.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/13705056501.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/wemiroranilorax.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/lafunetulavogu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c0b9d855a---82473103304.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/12cc9de534f6d500e5e8361fadffb9f6/71287933983.pdfIn PDF document text
    • http://sartor.ru/upload/files/90338726576.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/26071335916.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/meguwuge.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/28578392151.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fa7a7974e---35318763346.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/850820cc60e05d63123cb88e7a5af211/28069353855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=spanish+yo+go+verbs+pdfPDF 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_off0000cfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBC 19300 bytes
SHA-256: f57654233c6d035d79e3eb477ef4eaa4e1f6c14a7a86c2bf0b48422fa8d5f1b7
font_01_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 11028 bytes
SHA-256: eac6e4c648ee77a676bb0d2b6766a51b8320ef79048b4b082afa13a3cbb8a31d
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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