Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbd5ea7cad065cc…

MALICIOUS

PDF

85.9 KB Created: 2021-07-26 21:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52b5a9d096f1eb75833fd31a8ec66fc8 SHA-1: 6174f7df65361fb92e4dd03db2719dfe5858baf3 SHA-256: 1cbd5ea7cad065cc02998c88dee93a1bd12e1b6cbbc71967039244c32a5f56de
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that lead to compromised or disposable hosting services, likely for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests a focus on SEO manipulation to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://advantagelic.com/singhania/downloads/file/23338348539.pdf In PDF document text
    • https://elearning-chemistry.ro/userfiles/file/22874167144.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56eff279be---82330817673.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ce8f38004---vasumowukimepod.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/fixili.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/sezutudekasituwanuw.pdfIn PDF document text
    • http://aven.su/userfiles/file/powagixitiwawota.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ecb17e41797b6a95c8ddaac6050eb3da/89405005876.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609746926e9d3---sodigadonanufoboligo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/fipupagesopipixako.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/karudewupavuzaroju.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7711d9721b---bigototejibixowaduvu.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/xasowuwebexogep.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e17580348---52068017587.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073747609fd4---wujofirowir.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/607rirojavv2r369g5mu6v5n5d/15416648511.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f1985402---81531829430.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792bdeef7b6---dozibelozenepamobenuvoli.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b232eca97---safisiz.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/540eb18fe6d1ef1db96e683954214860/17624891741.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/goxorobomoviji.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/nivekoralidogup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pre+qualification+letter+for+mortgage+samplePDF link annotation
    • 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_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 16840 bytes
SHA-256: 178aa6125620da15b0335de1f89ad14828595ccdc0516938d5c848e37ff3108c
font_01_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 11068 bytes
SHA-256: 3c0905fdec8f54d47f9958ddb71e1b8c609766a4a5757056c98aae82bdc20ab1
font_02_sfnt_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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