Malicious PDF — malware analysis report

Static analysis result for SHA-256 547f7c38f30481e9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 01:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00adca9005e7ec61a6f3eb60817d6565 SHA-1: cc22444c237b1816a35bd358fd02019d849f8cd8 SHA-256: 547f7c38f30481e9077b9d03132402eef6bfd14f9373dc6ca65823e0e34ec94d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are confirmed benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/sk1vv0qiemb5angmgt04shjkm3/66809921996.pdf In PDF document text
    • http://wedding-box100.com/uploads/files/202109011016309716.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wobuvilasopefadezif.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bifitirilidew.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ad671b5ec74f4dddfd4dba487fe867b4/wezoridepuxuxiwajalazikak.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/26606640471.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/3924335671.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/7368192690.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/93203118130.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/utbjm3fffr882esdfh44mfvnq3/wurasojowivogupuxuf.pdfIn PDF document text
    • http://armanetti.com/images/56610159480.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/xonelobupejol.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kugerijifiwesuzoduvemekod.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/55632300092.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/winewiwudizuxufoxo.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e78c2a6e7d6e693357dc88382fcc9c36/83832285783.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/78824110573.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zarirusopipagurumaren.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/41621646601.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/45932669217.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/43201295952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=queen+and+slim+online+free+full+moviePDF 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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 17272 bytes
SHA-256: 9688446374ae0f8148ae453167f63777908565ba4cb556b6c22666b9209d0876
font_02_sfnt_off00011b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0A 10644 bytes
SHA-256: ecc23f94b3034c78961699c0c424414fe37698e4c2cde6e21b9340e6f5302488