Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d678720bd6f1f1d…

MALICIOUS

PDF

143.0 KB Created: 2021-08-21 16:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7cb621cdfa35757f23ad1d3996909ac SHA-1: 86bf195f418ac717dc87fef0d719b7232c038eb3 SHA-256: 7d678720bd6f1f1dea7c9c293f22335556fabedcd186c912bc7293a77e2ccda5
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and URL patterns suggest it is used to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4395

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=novela+os+dez+mandamentos+segunda+temporada+capitulo+18
    • http://coreaad.com/DreamDataUpload/file/3676315625.pdf
    • http://bisenzia.it/userfiles/files/42003512158.pdf
    • https://nanyangtextile.com/userfiles/file/gewuzazowumaxajudukisuxim.pdf
    • http://brkvinc.com/userfiles/file/11013229702.pdf
    • http://mixline.ru/img/lib/file/92193714298.pdf
    • http://youngshiny.com/userfiles/file/1625558287.pdf
    • https://skvely-kup.cz/files/file/34226451687.pdf
    • https://lawina-radom.pl/files/file/pakogujibefoko.pdf
    • https://channeloflove.com/ckfinder/userfiles/files/pizupiwiva.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7eeb37107b4t6ov3cpbt1gt712/xesitizopelagilaboboreb.pdf
    • http://unicaconsultoriarh.com/images/files/14897457302.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/92486309462.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608181e3acc60---kiketidowomivanug.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a603534251fb8e2a145a1bd25adaf2c7/11242123713.pdf
    • https://petek.biz/resimler/files/piwewimulupazuxuzipuleg.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6337044deec701141dc7475509abe0cd/farawepowivu.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/96pmdjdobiv8mb4bqh6afoao63/sovunejorijepakatasune.pdf
    • http://setadijital.com/img/userfiles/files/33402544445.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nmt1ff66cpprg081gd53tsahm0/xageniwuwajibivuvilatujo.pdf
    • https://art4you.sk/editor_uploads/system/files/40319738307.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/tuzuw.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cafa63500---37860525731.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870f36a6ee9---79274422239.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e029.bin
d44bc7d620d6abb52b5fa61766ad95ddba5d79ec05d68e86c5fe6c7b0fb8e8cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E029 11320 bytes
font_01_sfnt_off0001faaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAAA 16792 bytes