Malicious PDF — malware analysis report

Static analysis result for SHA-256 37754715de3866eb…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 12:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b36177e41168c65126356c6b93fe50a SHA-1: 3120cbe2ed6cb6c11293d3c4eb84cd31dd7faca5 SHA-256: 37754715de3866eb6ed80dd6cd5cd7590c16de27630ca2d8af0a171aeb5a5e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The presence of external URIs and link farms on disposable hosting suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=samsung+galaxy+s20+ultra+theme+download PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4j1le5obigftt85b4hs7k41612/82450058770.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/54642464078.pdfIn PDF document text
    • http://air-con.ru/upload/files/pukugo.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/fiwezeluxiwukegif.pdfIn PDF document text
    • https://ags-car.com/upload/files/16480505016.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9068bf68---xojusigefoguferegujubopid.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nulenu.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/16792824822.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/kumivaregunawegi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144245f3ac33---gegunulipofojixaluvep.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/30390291752.pdfIn PDF document text
    • http://newworldss.com/uploads/file/gebotefes.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/26129523457.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/wubotarivifidifufexu.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041641369692.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/99690622999.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/72181931423.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6b615bbc0e32d2c59cf3a8a0809a2d9c/wadewebirexugefewaga.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2kiqrcpd31u0mro6og4rckf5iq/46239929477.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sosezex.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a6955e2---fesati.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/92209602654.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/48648535329.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_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 17720 bytes
SHA-256: 5fb5a14e7395642a6710af2a67e0115698038c36e7a23d84daf70b3c4579af08
font_02_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 11320 bytes
SHA-256: b3541000f4e177ee95672d26e93af53a1a71109b6a05c8072ee60aa8c68648a6

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