Malicious PDF — malware analysis report

Static analysis result for SHA-256 50047b556415f557…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 20:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0085896b951deaec3798a11a3b0a9ff7 SHA-1: 4273a17c31e3eddbe2c2d73415ea27303837e553 SHA-256: 50047b556415f5576d6255e4ade6675f6572eb5dab594ef006ee9f241b27b9bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://happycondo.leaddeehub.com/userfiles/files/65152874720.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/vedimapibulebetagugibig.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/93405522942.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/66475098435.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/zedap.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/93386958696.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132bea6cf4f1---32489675602.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/funozowaka.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/vemani.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/16460973624.pdfIn PDF document text
    • http://steinemann-ag.ru/33056565277.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161364019777d8---82440840369.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/netimigesomivevo.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/43517852915.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e17059d1a---27702404952.pdfIn PDF document text
    • https://nistd.in/userfiles/file/tubonezinusilalok.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/og2iqio12kl8fs7csaitqjji13/pixorimuribegiposaja.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/dexazuruniwe.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/95745600161.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/25976302540.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa9b51665---wodomupisinogibuluwokuze.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/pinewi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161339ea45fcca---10134950968.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/rugepemivirimajigamikusan.pdfIn PDF document text
    • https://casaalu.com/luutru/files/96242999515.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7220e47f---jujumonofatusepebiruv.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/13916298537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dise%C3%B1o+de+estructuras+metalicas+para+techos+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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 18292 bytes
SHA-256: 6facf4e4db4cf952bce075530b70fde8a4625314a6c4d9627b4c8ca742bcd045
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 11088 bytes
SHA-256: d17eb950373d06c081c5753429008494799eeef0a70e9ee3d727e5a4d2931856

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