Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada87c9fabddb686…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 11:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 076a38d095b35c91964eda41ab293373 SHA-1: 985e67519808d86ace68ea55a4e679a27c121130 SHA-256: ada87c9fabddb6867b4c6a506f92164ee0412772bbb6a54c4433dbf8dd1d2130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests an attempt to manipulate search results or distribute malware through these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://mishelik.ru/userfiles/file/vazedelig.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ef52ecbcd53552cb1694911cff4f2c93/93843959493.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd16d4a47d---jozunemixozijip.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/tavizifib.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/fodibavorufikiwomogotudaz.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fda384f18---64761523963.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q652uink1clh5ok1r3ee7ptvtc/vazedikebesaxi.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/59135961268.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/lonogikutegu.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/nejusejib.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/78980577232.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a5abf177d6d00d10d6e43333cb218150/32347115383.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/wuxuvifevep.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ejefjlgq2u47f2olvgp4o7p9r3/lezolelufurumozipiwoze.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h12s965i6kv5t43jhcuhejg1l7/monumagugepa.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/pafilawozuwo.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/20204860284.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/jumofaxujaxewufefimax.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/fubukinabi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7ecb16dd---gowexave.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7028corkdrvbv57mkdhjdif4jg/34246555740.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210706114447019.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/3425998380.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609179a97042d---busare.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e644f6153ee4dd3fba8807b21484bd2a/gufivakati.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/33358124029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=string+theory+michio+kaku+pdfPDF 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_off0000bf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 11236 bytes
SHA-256: f68d89c115e76322ce10f0689bab0269efb451efbafe8cc80bea41b045614801
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16428 bytes
SHA-256: 2814c64b0aeae59da400fc4e791077a45932ea53f94dd0a33d429c6b4aefdf6a