Malicious PDF — malware analysis report

Static analysis result for SHA-256 40edccce12751698…

MALICIOUS

PDF

91.4 KB Created: 2021-07-13 08:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a010cdcadf4e2073b6bc26323e0c9ebe SHA-1: 385aea3421a651658ccc3c2135fcbeeccb282c54 SHA-256: 40edccce12751698c5339ef221278654f4ea7d70cec43baa0b6ad72817be6d82
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised websites and potentially disposable hosting domains. The embedded URLs suggest a phishing or malware distribution scheme, aiming to exploit user curiosity or trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://nomylo.ru/uplcv?utm_term=working+principle+of+refrigeration+and+air+conditioning+pdf PDF link annotation
    • http://ehomeforeclosure.org/images/file/37475266767.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/gagiz.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2psvkceqra4jn6o330bgototu0/jamamobaxulonasojewaruram.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/i76dvt2rqnngjntq5806ftm09n/7538463945.pdfIn PDF document text
    • http://alkanboya.com/files/file///rajazuduxunedirokosutulix.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16078063cc15e7---tagasuvijudemafivupa.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/82128221033.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2f15ed7a1---31705488870.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2b2fcdafb---10546268838.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd78bc37d9---pujumugarutimuzo.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/rotonuzatevapuxotilo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12c75a9b5e1c4950963f6cd5a270493a/fumeronofowopofugijasaki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9630c85b63---40790705365.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/jikix.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nivijufaf.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2bai9s4rr82evghqt7ptbj1n53/balinapibowelab.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f68ef0ab8232ce9a99953e8657b9616b/xamivuzeti.pdfIn PDF document text
    • http://gtshotel.it/images/file/91762971793.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/93349154653.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/19585022547.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b060c52a5cd---netisufipolawekigipigan.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/sozinebobopotix.pdfIn PDF document text
    • http://vhktn.at/images/content/files/53155271429.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/19136760766094062f71f95.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 17400 bytes
SHA-256: 1e91e9beea1e9af1ffd656b09b533cc602e117b4d6a17d597132c565f3ebc19b
font_01_sfnt_off00012f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 10712 bytes
SHA-256: 61e9ecbc7cc7a857fb0464ff495679bd91e0b6a179faf92cd7868140dab505eb
font_02_sfnt_off000147ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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