Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5738cb2083f7082…

MALICIOUS

PDF

118.2 KB Created: 2021-07-21 15:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 570739e7bbfc0c9283084f0d276e9417 SHA-1: 67292779e0d6de9e0fc9402b8245ca0ef2a93210 SHA-256: b5738cb2083f7082d2b679bd68a4dd8333e9040837bb3fe2cf13ec30f87f1634
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the link farm structure suggest an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16089c990a3fe5---66905242780.pdf In PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/sowezojo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0e62300dcea93e8f3856577cac6a29f6/vopemovozejipa.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/sulekozugalunubog.pdfIn PDF document text
    • https://12waktu.com/contents//files/99303906353.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6cggoib3qddepfst006v88uopi/gizuwovewokafoko.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ttk1ddf0e5qlf0s3tgn24494ps/37779733459.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/depolu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160942de4d2a19---majiwinaberidazusevixo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608581ac3289b---96841685184.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6tk6vjdbf5js8d7i7tll7hrdfe/11512076403.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/sufijojiranamunapetoniniw.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/93945480529.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092543e1e012---raxogudezop.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/32037521655.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/32021289022.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7142d45d4d---94332910580.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86a37af65372a3e5e227583e849dbd3c/pebujivuvuzoganeri.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/melewuliga.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b711fdd80e09713c7a557ab9d96c5318/23322329260.pdfIn PDF document text
    • http://benefielddarrenfordhicksunited.com/clients/2/21/2186b72972973349411f8b90e6071e14/File/guvejololatalavugijaze.pdfIn PDF document text
    • http://teplospectr.ru/images/files/12118462696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=feudalism+definition+middle+agesPDF 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_off0001693c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693C 10676 bytes
SHA-256: 9bbd060dbfb42e98e395ee90cce70445bf4058a9487f804078498605097e4aeb
font_01_sfnt_off00018176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18176 19680 bytes
SHA-256: 339af4f90f8144b72f9c33a8fc9e1bfb215483d55fbd6b9448c02be68cd6c762
font_02_sfnt_off0001b347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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