Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791f35fe952c389…

MALICIOUS

PDF

90.1 KB Created: 2021-08-24 03:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1f05ad498bbf192ed20f82d929081227 SHA-1: d14575d4305a7d28eab0c95f84473c7ecfd2c3c0 SHA-256: b791f35fe952c3898719849b5494872953dfa6200fc2332a8bd58ab5aaeb3a03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=free+pdf+to+excel+converter PDF link annotation
    • https://suacuacuontoanphat.com/upload/files/vilafekiwokinusironoraxon.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vrljc3oe8k5r839u01bnfinrc4/68012028294.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b163b74c1f4---tapopivajirapezoduxuvigad.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/regefuridiwivinolekeg.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072fde62c802---20831072242.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/wejigodamutawajafovo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6b7ma2b81gm0fv3comvlhaeoa3/jazefawezofuserajofir.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nelaxuxovitusowuxizugabax.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5e2371941ec811d1fd04a3b209336e1f/89516712190.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e30d23616a---mufapenol.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e59422831---pijawibolajupinodo.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/64761001794.pdfIn PDF document text
    • http://starsunited.at/upload/files/kumurukunimuganuwitev.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/wipirotunixifakatozaz.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/mupufepineniribi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ecd4b0cbb---64368982141.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/36421137579.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/12535906775.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/96680312964.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tedifosapitoj.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/16236631784.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/609c2b3c50fd269a328391e3c35f771d/24093901292.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/lolimidefigonup.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ccd791d2caa5c7e3e0fcfb573439143/xigigomifodolejitig.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b3437805ba75f729d93a0ae23ccfe30f/lutesewikafepupawajumex.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_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 10336 bytes
SHA-256: 54c87931bc54c10d2e6d9b88da8652fb14b89583b51290c1d88e1e56cb2788b5
font_01_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16652 bytes
SHA-256: 75b3d579d7583259c1af4ceb33c134d03a3533ea444783acf3ce7a265c3e3d72
font_02_sfnt_off000141e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1