Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eff6193bb2b474b…

MALICIOUS

PDF

93.5 KB Created: 2021-07-02 10:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43fce58d3d77ada0703a38c8b9c93789 SHA-1: 59bd896131050576a71098649d3d016a5ec84b78 SHA-256: 8eff6193bb2b474bcf490c0de90f0e66e334ed2d7d5fde55b8ebd9579630f7c5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm designed to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fitviewer.biz/files/file/24476446213.pdf
    • http://sacoorhealth.pt/site/upload/file/29377182438.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/4dc5ff46440fdb20632d0481ce7c4430/52388614195.pdf
    • http://assistance.uz/images/shared/file/vonodasowuganabinuvogixuj.pdf
    • https://accuratesearch.com/userfiles/file/tukanejuwolabifonuvito.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf22bdd29---88923371071.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d0956d68b66a8f4722c3559268ec6396/lodanuvebiruvanojozav.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608187e30bad5---62789516851.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b068f20528e---55213077011.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907e4261d61---lajami.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/772ee21481f82b962c791c87728b8e19/lusidukijagisodavejusaje.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f36d8ed44b75c30e83d75aab5b88fc98/29931151271.pdf
    • https://transport-vehicules.fr/userfiles/file/9617111628.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/cbc2d25ef352b4522648de22f4f71fea/loxefefazesutinedu.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2739v40l550uistfrj6s2b8g0k/88712078879.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/pudusam.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/6qfpi4v05fdgmcmogsgnbua3c2/40800033109.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc4191b1d---16724357568.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c74382fd345a17e086ebff16bc7a88cb/guvov.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaca43e29---futarudunanigujozuliv.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6d0b6e337---96624758019.pdf
    • https://aokman-drive.com/d/files/mixagobesodute.pdf
    • https://bnovum.hu/downloads/24756823268.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607053ca77652---45474249392.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/sqgddn32ugfp7q783k31t5n2c2/84269521682.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202151585277161.pdf
    • http://teplospectr.ru/images/files/gilefewuwelusib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=entity+relationship+in+dbms
    • 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_off00010a00.bin
100eb2c6186faebceca59807b3f64948c22bfec6e08b77655f97e4dbb150e95a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 17580 bytes
font_01_sfnt_off00013796.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13796 16792 bytes
font_02_sfnt_off00014fad.bin
5c2cdbdcf9bc1268fda967d53bfa3bcf3f224e612e9ae556c8ffe9fe30f03e92
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAD 10896 bytes