Malicious PDF — malware analysis report

Static analysis result for SHA-256 b442dd285fb45083…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 01:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ba57b550ce461fcf7905e3aefd91f69 SHA-1: e363ce7356ef02a70a5f8a035b33eaed732b45fc SHA-256: b442dd285fb450835468b381618daf5c7f59a804ff698a50678b510680e94065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://brooklynsmokeshops.com/admin/images/file/73615903287.pdf In PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e70424c8d60c5363f6e45155875bbb04/47102960637.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3693f6f0f24191625f2df48693fc04ac/jatagujatimopudosoto.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/36012159887.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fuv8h2cd5qutumctuu55jin10l/40617009725.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/vutiwidiwogisajifuvenigon.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/dumexomavotifipogox.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/70111674056.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d475352b679---virebalivexuzo.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/70768260702.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/3214898980.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a9de7adc---2134690022.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///45536150480.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/36593299654.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/babovexam.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/sesogujolexekedexubudetok.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/xeberuxuxegel.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210614021544.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xoniradoko.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/10707175879.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077846b820e6---zurapawenewexokepomutakux.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/16hmpcssjpcmg9h749q8h7pn88/95285259361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lower+case+lettersPDF 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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 17124 bytes
SHA-256: 94765b24cd2281f35009f3689587b645e3029f322100e047285ae91c3029117e
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10072 bytes
SHA-256: eeb03db28fcfab8f78291f7a70838e6e19f4f24731f2a4d4da1cf888bfff1ba1
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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