Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a741e5c7735499…

MALICIOUS

PDF

88.4 KB Created: 2021-07-01 22:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f7d1e71c394e54c69585aac9db3b674 SHA-1: ae65522c6985e10c01890cfb9f02517ae4da5702 SHA-256: 57a741e5c7735499bbbad214bf2e5de703f0ffaa7dbb6b0c687236b30a2c5caf
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The PDF's structure suggests it functions as a link farm, directing users to potentially harmful content hosted on compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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
  • 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://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t36sb4b4fl7pasd5ref4sbp29s/18456291171.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a84401ed700cec5514f8dc37f6fd490a/32101724141.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/69eae2f24a5c648bbe0840d4760abb0a/belanuxovugimime.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098906bec352---sowuladizuxewokalevepup.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8mor4ml7isumlsen9mqrs20e65/36286698808.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/sosatirike.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/78ui8gbs9ir2ps8ksi7vjj79jo/lezolovama.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/v7ejh9psbt6u0cha2ml93f2h9q/38234651167.pdf
    • http://meble-tk.pl/userfiles/file/91953397850.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bdd3038947f934b71fcd5832fb12cd1b/36183901686.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/l2leh9jslp2su2qb1eooqbluj9/81467015660.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160960af5c1afa---wotow.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e6f26f20---63122178733.pdf
    • http://bahattinburyan.com/userfiles/file/fewinesexufi.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a491d06a287---41121286730.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e7c86aa2---vomerijedisotikepuwubut.pdf
    • http://activesolutionelectric.com/images/file/tereme.pdf
    • https://wsbtitan.com/images/file/38746026350.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/48864fccfc973b49b3c86d30685fd70e/govilabeditadof.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74bd9801e---falatutumamaridekixi.pdf
    • http://prof-cosmetics.com/upload/files/16177552650.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0b963d4eee3941f7c585955e92e58002/99843244507.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=grand+canyon+day+hikes
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1ea84b2cc544683d24378c36ad93013c/nifafogoxibu.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_off0000f753.bin
1e10af32338a2866278391c9f1c441765f1e53ee0bbd1438ca1758e06fdfeae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10568 bytes
font_01_sfnt_off00010f5c.bin
4054f6f2cc80ce5a7f08195e16ee48c8cbf2ee84ae35ede640d23a7dcfcfba37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 17448 bytes
font_02_sfnt_off00013caa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAA 16792 bytes

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