Malicious PDF — malware analysis report

Static analysis result for SHA-256 450af0bd1f798236…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 22:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f007163664914517450cbef40fcd93b9 SHA-1: ce2be223eecefc8188cdf1e2d03b2c534c892e16 SHA-256: 450af0bd1f798236490a1954998455afb3c70822cc0b632c8a671e896bc19636
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and small file size, typical for screenshot-based phishing. It contains numerous links, many pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 0 text block(s), carries a click-outward action, and is only 70 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://clubkdo.fr/img/pics/files/2081985072.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/kusenume.pdf
    • http://htwy.com/upload/file/16027515529.pdf
    • http://mueblesdepladur.es/1/userfiles/file/panadalusiluw.pdf
    • http://jshtextile.com/UserFiles/file///romidevijegamo.pdf
    • https://karaari.leaddeehub.com/userfiles/files/fawifujisoniwo.pdf
    • http://mengnuanua.com/app/webroot/files/files/38874263687.pdf
    • http://cautrucpalang.vn/webroot/img/files/94100064512.pdf
    • https://siemreaptraveltours.com/userfiles/file/kezadoti.pdf
    • http://precisao.net/files/files/46138694186.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8319d283---58801143865.pdf
    • http://baoveantam.org/upload/files/93057692587.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/6135364046.pdf
    • http://ty6600.com/userfiles/file/retakudape.pdf
    • https://basisnomor.com/contents/files/kiwigegizawozozata.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9a2361d2---5048282371.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/33969085849.pdf
    • http://trunglam.vn/uploads/userfiles/file/vifiveb.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/88832821920.pdf
    • http://finpacecuador.com/userfiles/file/20498596498.pdf
    • http://bladensburg.abwingsmd.com/uploads/files/sujafowatigonuseburix.pdf
    • http://szyqjsj.com/UploadFile/file/20210916061835542.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sopoj.pdf
    • http://jyjwqj.com/uploadfile/file///2021090517143751.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8b192b0cefbf0f57294db27bbaf08927/56598080331.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/fepugevamajefedinukeb.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bc60e58d81ec2cd0f0f408b75177d75/47362545421.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sad+romantic+movies+that+make+you+cry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b74a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB74A 16792 bytes
font_01_sfnt_off0000cf61.bin
2014b897f2b24451b59fc3fb05430f4ca9157d16efacc6684b3b2e175d7b3f2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 11036 bytes
font_02_sfnt_off0000e8e7.bin
1641ef6961a24b3d3371b17485986bec46146cce56043469735ec1394808080f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 13972 bytes