Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa7a4ff772eb270…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 03:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6de9126a6b5e1e89c86538e8d559a0de SHA-1: 0c361d74ea9047e71dcf4e1e953a9c2489362cb9 SHA-256: eaa7a4ff772eb270bfe0c56f75debe24c17a0db6171e8b11e832af3989a14cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://philabc.ru/uplcv?utm_term=air+pollution+standards+pdf PDF link annotation
    • http://kidsjeodo.com/images/files/70792941672.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/80154749865.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e49232f0---29068551532.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/kapudifupilireruzukewoxiv.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/77037681101.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609044c988ebf---saxonirubovina.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/difaluzexot.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d607896bc12---46100909298.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3003ecc3e---90881004069.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/31240427738.pdfIn PDF document text
    • https://angkagenap.com/contents//files/61809062774.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/kezowizixaxivazil.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac06f3905---56480888720.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/pezap.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/duwuvowabogotisepuwid.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/61893311990.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6hmquam5mdob7ipihekh6oeph8/56598738518.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/jizivekexokiju.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/85039732690.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/50286554437.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2439a34196---32765978458.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/65tt5ald7vuu64lruibokg3n41/52920881582.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/zozofan.pdfIn PDF document text
    • 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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 17944 bytes
SHA-256: 658133e5278ee9e68140f6fe3e275be7e937d85cdd5ec10ab91925f303925c96
font_02_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 10440 bytes
SHA-256: 456340ea14474b5da1a947143015f35a49fbf8a2256bf215d72266fcff8d62fb

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