Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7edab2107a57b67…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 03:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 80b5946a2df1886810a22d35722b5494 SHA-1: 6567c93028b207ef96bb7fbd479da2cde43c4632 SHA-256: d7edab2107a57b67ff57a82d752e764fd6f82b3b9cecc9c0879b065244ff7762
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially improve SEO for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16090b63cdaed0---ruvemurexawaxapo.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b8lh5025ho4bqinarlcmj3ls94/26217912124.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/50963548487.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c5024427cd37d4012f0798a192e00872/94761043182.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160722c97828a9---dipamufis.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091a427cd27b---neruforanirunukevipedog.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7eec0304b7e26a0236d08ef3efd6ee91/penenelufulugaxumet.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ea4d516f2---26346561859.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xelukitijefop.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/57144acb5206b8ceccb7e0482e378e56/lebidumevekepozopuzolokid.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/bilerokavajulalapob.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/79n4i47b4pgmhe2fmq3j8crf58/gefaxizobizuvex.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97397d1d08---43659169496.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/82000468024.pdfIn PDF document text
    • http://alltechsro.cz/files/lamujiwukanafe.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/65c987af746abe36a9b4a26072aedf3a/kowedusar.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a8a7c33de88a08f6655a72b8dae9abe8/71387788642.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd215a113b7---doxemiwon.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/27473430500.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a038c91b68c---13900666738.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dc4012772---legikemap.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/e794c654f124129bf8bd6aed8e0617db/lilidirufodifu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/nenamukinafabup.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/sukotovefiruwutaj.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ug7hheuv1ipv0jn849750lfjv0/tirejaxunivizajavu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fe189fd67244c748c36210c843cc48c/91113724298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=adding+pdf+pages+to+wordPDF 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_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 18124 bytes
SHA-256: 6c5dd861fce216bdc32988f40a4c9412b0541f15e77e0875070539f58f174a16
font_01_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE3 10696 bytes
SHA-256: 13a3eb7d88f086787d3469b1022fca0a20ed2885ea491888acfb2c9279682b12