Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0817bca8038a76…

MALICIOUS

PDF

94.4 KB Created: 2021-08-16 14:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 474db4977066aa4e8e1123ab5ded3e40 SHA-1: 28766dbd52870eb354eae603135220a9ff35f846 SHA-256: bc0817bca8038a76497d9a755f172288897e60eb7c705a1b3be9bce442d1cc6b
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9460

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=ejercicios+resueltos+de+razones+financieras+pdf PDF link annotation
    • https://ceccargiurgiu.ro/userfiles/file/82981171242.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070911132ea6---72496321663.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/53747901757.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7a297cfab9ed5dda7e8741cf9e2c7fe8/70817506904.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/atp89nipnstq9e3gf14j6o2jsb/21049599888.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/sifiso.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/10974952119.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/nuvobafowabexenixetiji.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f3f960116d474638bf3406223aa8d9d/jugigamabefopuki.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/fevomoronawek.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/40674794298.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wukamufowofilivetujex.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/31824659878.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/xoruwodomovani.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16104afea741b7---vesezuzewopizu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b373a3376---ronulanunak.pdfIn PDF document text
    • http://stagnesreunion.com/clients/e/ed/ed16748122b3ff8ec97113314e0446c4/File/58326463388.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/21488128426.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/pedilage.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ccd4898456---murokipotezejosabolojobog.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d5fb32b9---difumikawakavusot.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/07f020f270a0774a8e43b3ad9822a918/32720753586.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800a87536bc---vajalejufo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 18976 bytes
SHA-256: ec2732aacfe8e7c754e754a37e8ecfcbd01f5d28f24df81d841995be96d999f0
font_01_sfnt_off000152fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FC 10884 bytes
SHA-256: 448337cf1e412a21f5f872a0799bca7dbde24b04db3370d46c169bfbe77a16a9