Malicious PDF — malware analysis report

Static analysis result for SHA-256 43977adbb960e6d6…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 10:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b07e70903229c9a31ef1b9bf5ff1a6e2 SHA-1: 02b55b19a3da1de886b1145355da4ac0d9030632 SHA-256: 43977adbb960e6d61ac2b4cd09af91fd6bc0293dfc688e9af9640fe68d4d3600
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to redirect users to potentially harmful sites, aligning with a malicious link strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://przyklejki.pl/userfiles/numupirudoxadiz.pdf In PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_14AC654CFADAFCAC.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/81199387033.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lodamelilekobefu.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/gatafukesuxiwigozax.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/71128187911.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/29191412671.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/sopalugasuzovokemorema.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/vegabipomojirifijuge.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/16083337194.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/72514928020.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/jojimugepawef.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e3d2fc90e3cad25f42b09305c109f7f1/97472421035.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/79082792505.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/30993491012.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/92045ed6o5mvhno2stiuhr5ob9/kisifugajarida.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/kirinilezarunoped.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/30586570723.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/87814524293.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/bozoz.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a6b7ddce---getefizukomiwuleridetune.pdfIn PDF document text
    • https://renewone.de/files/vunomipirarexivizasotole.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/tozefisonipofez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kimetsu+no+yaiba+movie+online+streamingPDF 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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 18988 bytes
SHA-256: c9186f54b04477294726714176238d66eaa142a7e14a201cb7034ebeef64fafe
font_01_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 10864 bytes
SHA-256: 7c243edbd63577442046a8f80b787b2773435f64d59850e88219d7930f1187f4
font_02_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1