Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d86026b1ccdb039…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 06:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2f31136f42953b15823d644e061e6d7 SHA-1: c6e0e0b41b726ca901d885e306e601e47b8a276a SHA-256: 8d86026b1ccdb039a42eb934f75b25d9e70c6ef2fbe3163dc32eeb0a1ffa4443
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://vibanghanoi.com/uploads/files/ritix.pdf In PDF document text
    • http://yonseri.org/userfiles/files/72730263829.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/leduwasuborub.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/30115760956.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/zipopedebavi.pdfIn PDF document text
    • http://poliinc.com/upload/files/wobotoboxemoxebeperave.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161300b83983be---27652979313.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/zufanusuwufi.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/051604405151.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee150d894---bazuvenolexutiwigipavepu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f0f09070---susujunubiwatogotej.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/vijobimagubakafagabizixe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4144cfb4---muvijedupasoluvurasizir.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/3380724123.pdfIn PDF document text
    • https://datajournonepal.org/files/25376855557.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2d794a6d---fuwonewaxixine.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/xitijomipidulobuniwonu.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/jegusakefopu.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/ragigapujizabukeki.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/37074351400.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c2437cc9---90664403476.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/54826110285.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/kaxidakuxezuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=zarchiver+app+apkPDF 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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 18932 bytes
SHA-256: df8c79edb8a578a1933b67f95e09574e306d4ab511cf4d4b2b3b6f53668a0eb8
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 10056 bytes
SHA-256: 40afa50103a86ed475c0db267f117c966475b02fdaa0ffa9547fbbfbb42fe4c7

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