Malicious PDF — malware analysis report

Static analysis result for SHA-256 4831690c932fc426…

MALICIOUS

PDF

97.8 KB Created: 2021-08-04 18:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2af6af8f5113069dfa888ff732ac2ce7 SHA-1: 24aad6e4a57b7fa4ad25cacc917d66d0bbca6780 SHA-256: 4831690c932fc426f3873e08e6511df2309c9b084fdfc08420d32d15e9748da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to domains associated with link farms or potentially compromised CMS uploads, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://btc-ltd.com/upload/file/pilidinubuvevekitatoxa.pdf In PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/31336965801.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/savojusiput.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/42321029897.pdfIn PDF document text
    • http://ned.ru/uploads/files/vemumiwozuxe.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gedozenanefovug.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/84325486375.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/mizikubiluxorowa.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jm398fpk0d97db16oflmfen8jg/kixovotijeximexekem.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/4mq2gm7b7i328bpevqs6regv36/dokagedijar.pdfIn PDF document text
    • http://healthywithhart.com/res/file/71523720464.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086214d011d7---20081907588.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wureza.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d771ce3b38fe5d0472ed227716cf3f16/61732686415.pdfIn PDF document text
    • https://telorgabus.com/contents//files/62412968307.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a8242390---xudefas.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f8eac4f6d---95074798946.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210623041612.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/togeworunipeto.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/shokupg3k3f7f33doj7kfra2i2/84041697111.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/52998680767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=new+relationship+poemsPDF 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_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 10580 bytes
SHA-256: f8521f2f1fa91d44f2171f918d7446ce93617d04b99e1e44fdf252a9c7913f82
font_01_sfnt_off00013121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 17880 bytes
SHA-256: f2e30c444e1bff290085aefc03460b540647a189e6b93ed9753e42fe61b7672c
font_02_sfnt_off00015f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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