Malicious PDF — malware analysis report

Static analysis result for SHA-256 874356820a6552ab…

MALICIOUS

PDF

82.7 KB Created: 2021-06-29 07:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 157433eb23ba4ad3db56e1e3ab11648d SHA-1: 56475459e1d7eac345eecf1c923c788b626830bf SHA-256: 874356820a6552ab3d239b5c3db15a6b56cad7c82153158a6a4fbd205d15fdcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://krisoc.ru/uplcv?utm_term=bengali+meaning+of+ward
    • http://balogmihaly.hu/UserFiles/file/nixinowux.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a9014d1368a---78018284560.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5336ed970---97412344967.pdf
    • https://a2designbg.com/userfiles/file/jemavakavoxanijuzukip.pdf
    • http://banghetretruc.com/media/ftp/file/subuxawiruvo.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/32cc7bb7006e99462dbbe1eb6fedb52f/99838771753.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489c5a28f2---35215695682.pdf
    • https://adepotcustom.com/UploadFiles/file/20210502042533118.pdf
    • https://imagebeaute.fr/userfiles/file/letixag.pdf
    • http://project-lovcen.me/userfiles/file/gubapoxudalikejakaxu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8bec3ffa13b083841bde82d68511ed4a/timuke.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/dc385e393be1e0355ca946f5ce684be3/ribijisebakaz.pdf
    • http://botosani.ro/img/uploads/file/49529773349.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4005025f2d200acbc6db39b0f15d8ece/katatidus.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/dt15hbcn8cav5bfj1vjpnratq789lh1d/zitijinobesivuwiman.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8967991a---41795883085.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ccb055d5---bidomugoda.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/t0m8rig6qmufm9m7sq3lbq7vjn/tewasesor.pdf
    • http://auxerretv.com/content/public/file/ruluruvagegab.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/jutuxozowumokamij.pdf
    • http://consulcongress.it/uploads/assets/file/mefirupuremujuxumubiluni.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e40f66dca---79073206050.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/97c4bf0a594cec581a6ba9798e09857d/31324465317.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a64068de9ed786ded2db3f40a7d9d1ec/23552033868.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae541bf9e3---52718229232.pdf
    • 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_off0000e282.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 16792 bytes
font_01_sfnt_off0000fa99.bin
9484f1a64fada6659d0b466097b73eb462bfb13a664ff6ddd24a64ce966123f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10568 bytes
font_02_sfnt_off0001127d.bin
5292e35a3db2c2ed95861cbae0ea46df93462c97c62a59b42600eb7068afdd45
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16220 bytes