Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd498b73722a6a8a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 15:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b48a8ea9f6f4c2d9ac2c85204da7e91 SHA-1: a6f61f508acab47057a5b1ce33b8ab75cf0b049e SHA-256: bd498b73722a6a8a495ba973b689cdad41cf99d4aa3e894c8839d62376e43c5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. This suggests the document is designed as a link farm to direct users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aumnat2car.com/ckfinder/core/connector/php/upload/files/pevemawane.pdf
    • http://enricobarraco.com/files/jogax.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d07a147ef1bacf86a47cce0ac0f47576/96983799833.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/39599919032.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/guxujonut.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffae4e174---16391108508.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f8fe7fc7d95eb7891d52b9eba55bf420/bigisi.pdf
    • http://all-vehicle.net/js/upload/files/luvojemimasajoruzawum.pdf
    • http://tdjl.com/uploadfile/file///2021081517511551.pdf
    • http://pass38.com/images/contentimages/files/kafijini.pdf
    • http://laihoawedding.com/app/webroot/upload/files/26644029303.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/68u2ed3065vm9lkuduhihhe04g/nipudunabonekozuboperiza.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a476f756fcf---56080154205.pdf
    • http://greenhousehotel.vn/uploads/image/files/najopiretemawa.pdf
    • http://wumag.pl/userfiles/file/fagitimitaxopepimi.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/11440736416.pdf
    • https://securitegenerale.tn/userfiles/file/15724367559.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lqs90ruf43o08a98a1t6b3mfah/metotafik.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/27a797546093dac96bef50c578d9059a/96088255893.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1fc383b4da975f39a9153ffa4d8b2b12/vexomekigipuzikiz.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/18319335194.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ef4822709---zigotewilesoborevuwoza.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510f0e577d---tiweti.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/mopowedafaxidagituj.pdf
    • http://keifo.ru/ckfinder/userfiles/files/zofebewidonot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=biology+pdf+in+bengali
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c146.bin
ffe91c977abf475a4201c51aa5047eb1c2b30ad65946eeea9867ceac60c47b8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 16548 bytes
font_01_sfnt_off0000d889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 16792 bytes
font_02_sfnt_off0000f0a0.bin
3e5f10be335f514ebbd4e1be97d447af7e6f4d49b28b11eb67d0bcb303feb439
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10612 bytes
font_03_sfnt_off0001088d.bin
1bac8e7120958318b942bc5eac15b4794282ffd391a66d6107307cdaf0056df8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 19520 bytes