Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f5c89274d45095…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 02:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67f9fa43c48289a6f8d30fcb6aace2da SHA-1: 8344d828253a4dff20553b6abf790ab6db812ee1 SHA-256: d9f5c89274d450951104d8f1589e09eb4193e28479e81c035ecb6609fd2e17d8
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage, suggesting a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://tafgambiatours.com/userfiles/file/23939264884.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad59442fe6a---delari.pdfIn PDF document text
    • https://buka.ru/sadm_files/zumaki.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/susokajunogegodapuduk.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/t82aeqmp0qtp6ssq1lsks2gajs/sujigixubeselava.pdfIn PDF document text
    • https://menu2uplus.com/images/file/22652191792.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/lupigukesoweluvojot.pdfIn PDF document text
    • http://rayer.cn/d/files/8588182709.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/towunanevugiwudasotovi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b891c914e3---49923640139.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/bikujas.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701811453b2.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gapimifajinuzazaxi.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/gazujevafumiwapumupinupe.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bulozuzosozafopojatoj.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb8f08786---35008037371.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7g42ks18oo3aci9ufttcpg43q6/25256603706.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610fbd8c8e5fa---5664562376.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/86395805065.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5raknht909e2eg2hkmln02pt34/9342643546.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210730002854.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf361132b1e---magavekogepufada.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/262173a1a97ae10715505e905841c86d/99848333195.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/46830600897.pdfIn PDF document text
    • http://placc.info/up_image/bofujenen.pdfIn PDF document text
    • https://store.steIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=five+nights+at+freddy%27s+help+wanted+free+download+non+vrPDF 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_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 11052 bytes
SHA-256: 523286f1102162bd58d1456f706b72aa572e61f247ecc4a3e2f89c357f4c446b
font_02_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 17516 bytes
SHA-256: 5720bb51632a0d8a0e637830934bcc58379f6eb67e95d937f1ff64598e9fa9fe