Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f362f71ceaf6a9…

MALICIOUS

PDF

99.2 KB Created: 2021-09-16 17:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef1f4aec4b3b6db35c969c7028969c28 SHA-1: 5a5634eac0bc69a9ca3b016c68db08191a9a1ec9 SHA-256: 44f362f71ceaf6a9a8499d37d6c4e88cdd85536c1580cc5596ced95ba8699a3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, with one URL explicitly mentioning a game download lure. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm suggest the document is designed to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://stellarp.com/userfiles/files/40974933905.pdf In PDF document text
    • http://tataservice.it/userfiles/file/98450928234.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/20521138469.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53883533682.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/31919653194.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/redaburufadopemerojowibe.pdfIn PDF document text
    • http://signauction.net/userfiles/file/78879563914.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/95412803967.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v5kahvml25rtnm3up49v1iv625/14746669527.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/xifakekeleje.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/12061275643.pdfIn PDF document text
    • http://boxethai38.com/upload/file/47861830711.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/ninakazabikotudidelojug.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021912123654379.pdfIn PDF document text
    • http://zzquansu.cn/d/files/watelagifi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394f368f854---27440822603.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111418085527.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/50487315020.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/57477265199.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fuxoxoxotobimirurejam.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/wupoladijijawolowopoginu.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/lomuliduzajadupizirej.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/c2dtmpev067fr6v30dgohe54vi/maboferadaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=asphalt+nitro+java+game+downloadPDF 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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 25748 bytes
SHA-256: 6d3afb2505abb174e37a7ce854fe25d2e4a6dd62275d08d40eb5b3dcbb58b7aa
font_01_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 11104 bytes
SHA-256: c8c4e5deb5d01fa0eb5ad4b8ccdea243c0ce1af81ef7931b2fcf4b23a5f0183b
font_02_sfnt_off0001489d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489D 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_03_sfnt_off00015e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17653 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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