Malicious PDF — malware analysis report

Static analysis result for SHA-256 b852d662d9d0766a…

MALICIOUS

PDF

89.0 KB Created: 2021-07-20 11:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69cf5654cfa4276e5146b2b0c0b0d598 SHA-1: 545f0b7e9dd4ad0ebd84ea383e7d2583f2be32b7 SHA-256: b852d662d9d0766a38aff6761b0bf5294d40b03bd447ac451a4df65e814b48e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160709a0b81f82---90310371324.pdf In PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/nanuxagivoke.pdfIn PDF document text
    • https://penal-garazh.ru/files/gitikavebazuxowiralikurir.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/637d6a6fed509854de89043d781cc878/fewukizuxanaboxo.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/kumizuveluso.pdfIn PDF document text
    • http://asfalon.com/__files/file/risevupejirubel.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/17222151866.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7ntv335hv8m9cei0pn5hp3i8l8/morijexemakoxebolomame.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc27deeee---tozamebukijojiwu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/kixejizesuki.pdfIn PDF document text
    • http://waterreducer.cn/d/files/94940542589.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/birugajol.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/bopisefadopos.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/14050849497.pdfIn PDF document text
    • http://zuche0551.com/upload/file/59869190074.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/zikiwej.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/6ff67597dc920d4ce54f7da5bfaf5bcf/faxujegaxasuzo.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/lomuraxetit.pdfIn PDF document text
    • http://fittbike.hu/files/file/kogililulo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5e655bc5cda99b37a3c1ad4bc7dfd4f7/89028956907.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9598218ad4171eaac22a1584a9fca937/56896245073.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/93856625252.pdfIn PDF document text
    • https://airshow-bg.com/file/dijodizipojobino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=olympiad+for+class+12+science+studentsPDF 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_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 11192 bytes
SHA-256: dc36285d22b02066296edb77fef0fb14181280baf9d834bd2fbc807103d4378a
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 17676 bytes
SHA-256: 075db395e93c7ce70814a20e3672652d1d443c9d40bbbe4be8a3b722ce48f5b5
font_02_sfnt_off00013e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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