Malicious PDF — malware analysis report

Static analysis result for SHA-256 336f5ec762f3ec00…

MALICIOUS

PDF

96.5 KB Created: 2021-09-07 12:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78d752949c85c835f5fa1053bd69bb71 SHA-1: 5a6282573624653147ac2d90ea08fc7a8ed7e7f1 SHA-256: 336f5ec762f3ec003350cbd276d072eaed5f7add02b7c2794e180247e46ddcb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://telorgabus.com/contents/files/48615076446.pdf In PDF document text
    • https://dacinsara.ro/fckfiles/file/xunosevagafafi.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/52788161793.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/gufuva.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/99012080156.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/60771828814.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/kopav.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/96498846084.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a02fd4cef---51263921596.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/pubaruzewosesomez.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/zarigubip.pdfIn PDF document text
    • https://kapokcmassage.com/uploads//files/202108052303033401.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/37175687006.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5454b98a6f7b7d94880c597ab5883dd8/xigopafuzijujifego.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/zapevofivozonoxen.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8d9483fb---17643546472.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/turujojelilefefapulukitis.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ea2aa58c---66637728875.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/55078736347.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/xopigofezinut.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160723ef8c136d---tazozaz.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/25397931982.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ce2c441bc5ecc8aa265ec85a575e2a01/vareporeg.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/fijevarijujefike.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49bc760eb---xutudimajamotale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=area+of+sector+gcse+worksheetPDF 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_off000111a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A2 10532 bytes
SHA-256: 542cecdfd616e7f711e98a63353e47966a9751d038c3978e09878b41ffe7cc15
font_01_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 19212 bytes
SHA-256: accdd6b1ea066d9d6ae5c4f499eacc298d5134159475e960f1daa8550c988818
font_02_sfnt_off00015c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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