Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba98c1cc65f829f0…

MALICIOUS

PDF

83.0 KB Created: 2021-08-08 00:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e281f743483a493222ae6547afd484dd SHA-1: 4b3da7eea24ddfde8a0db006e78f95b58e42ba96 SHA-256: ba98c1cc65f829f09c52ea7f12b99939cd7465ff2adf2e6de07c1c91f7a6fdf1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous external URIs pointing to websites hosted on compromised or disposable domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://provia-events.de/pics/fotos/1/file/pafupaxetozub.pdf In PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/22305753565.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/bokujegekosorif.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/debujigelisivin.pdfIn PDF document text
    • http://hciclerp.com/asset/uploads/files/12535823987.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8v6aprlvq0h6c8nmig315aihne/97487577024.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/k18ifu53ugs49nsvsmm8ctd5u8/56963679813.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/3067019278.pdfIn PDF document text
    • http://meta-min.com/files/medogesupawuxekelaxupij.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/sakexikugerajipapino.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/benitafaxoneketuro.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/26885303994.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/pakeroxusowag.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/65793408926.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607659a02a8f6---8720111118.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/bopixifo.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/mulodumog.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8264ccae3e---31723592879.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/pudiwoxapurerozajadem.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210705041359.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/f6k9sol9m39d0ijp318hrabcb1/saworinurujexobunajiwanad.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/83603228501.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/darc32puit5ecn70aud6km9cb1/77609763030.pdfIn PDF document text
    • https://werbemittelag.chupload/file/puwaxoweseje.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160838272e445f---bifubiroburevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=evaluation+droite+parallele+et+perpendiculaire+cm1PDF 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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 10708 bytes
SHA-256: 21843a20e92c757f010e69ad4a265f4fec997716433fcfc23184d113d31431c8
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 18200 bytes
SHA-256: a9674c191fca37f1a9960a84d876e70573665edda279defcae047962a56fe015
font_02_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1