Malicious PDF — malware analysis report

Static analysis result for SHA-256 f981b79c26c4651c…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 12:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4ddda9a3543ac8ec6b48f5c508be5e1 SHA-1: db47adf63e028df4f87bd615233707999a890e54 SHA-256: f981b79c26c4651ca1aca098a0b9b820f597c1f1674efb021f294899709c462f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure, with minimal text and a single image, strongly indicates a screenshot lure designed to trick users into clicking through to a potentially harmful URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=sms+broadcast+receiver+android+example PDF link annotation
    • http://fantalife.nl/userfiles/file/98990900615.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/39938367795.pdfIn PDF document text
    • http://goldmustang.ru/files/files/situj.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/rimogirepo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b005496ffa97f2159f3ea0fb904fd54a/zaraxazekadobexeno.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/kapikisifufovizafudujub.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/89130714928.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/mowodunumozebe.pdfIn PDF document text
    • http://sinostandards.net/upload/files/wisubamojugetitew.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/faxal.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e76c2dbad---46728054150.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/74487977329.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/5939279985.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b417311bf4---faloroj.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/xasufemulumapotimaxofore.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-26/20210926132744274118.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/70250758697.pdfIn PDF document text
    • https://blogsma.com/files/92461190587.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090907505140.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vofurim.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210917_E771201275335F45.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/47820396999.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_off0000ac9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9B 11056 bytes
SHA-256: 867e0991d857669b85125058df0eb9c85fb9967b3efa014c2e885c22171d170a
font_01_sfnt_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 14300 bytes
SHA-256: f60882f3f99ee62fbb349222c36597fa0791d6466cc07effa3a1cd1182cf5fe5
font_02_sfnt_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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