Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf1375d38e82e8f…

MALICIOUS

PDF

83.6 KB Created: 2021-08-03 23:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9d5c43451b7a1883245368f79f66e81b SHA-1: 0a70532fcf0d99c448ab5d6e1d0c3a1f97f27f16 SHA-256: baf1375d38e82e8f60f38be58422fef81d868213325c19f6106522234954f4c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points towards an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=dstv+supersport+tv+guide PDF link annotation
    • http://sun-eko.eu/files/file/93735676390.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506170531360229.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/zumepamepamivufosobozi.pdfIn PDF document text
    • https://kopari.hu/files/file/fodibugow.pdfIn PDF document text
    • http://ciskmv.com/css/file/72069899552.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/45153555040.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/xunolosepefumixatoxewaf.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/iqgj4hakeol4i3v8dceer6je10/fopejize.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/tesalapukamejegojeli.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea35142122---73235975928.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160760a8827f76---pibikaxatobopuku.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/nevuvaxobeg.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608297c858453---19729462742.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/348b854dcc1b107e7b448d23ba0b2607/13430216266.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d867c8cfd337b091f07b9c9a4aeff0aa/bukenasiwagujaxedev.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/71229725443.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/6152441973.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/gosojoniper.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/82299946448668a7a1b21adf06593ffe/wasuviwifisefufabosarog.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/zopijusikonod.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cab220115da---sadoledugukav.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df77fd6bee---62793442138.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/sibuxaxemumuk.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080792bad605---bubukokap.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f626eced7---goketeve.pdfIn PDF document text
    • http://normel.org/files/upload/file/nazedipuxibivusajib.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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 10424 bytes
SHA-256: 4c1d44223bbf7a93da34b9d5951c21b0e84e5b0eb882dfb61ffd532f1e2af8d5
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 17704 bytes
SHA-256: fa34e53a415de746ddabc7eaaf7cbec533d5f5dfa2e02e48b176dbe8fdf4e4f9
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1