Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b76a17f0365daf0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-15 16:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 445290a17c321d58feec9bd3991cead9 SHA-1: b0c084bfd7927f592145f2db470e86d18bada40d SHA-256: 1b76a17f0365daf05df1176c43ce3a3ce2409e5994c5eaec63c1711801cf710a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://safarekhoob.ir/basefile/safarekhoobir/files/fifete.pdf In PDF document text
    • https://sofahatinh.com/upload/files/kosefomuxiwa.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/4851590201.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614110de77135---10601574664.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/gukujavemabipazu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14d0051bf---84109329149.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/zadijasidewotugal.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/woleluzazepipon.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/vadusim.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/45716359768.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/xavibenawuwawonubetol.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/76689530181.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ue0ttdki8bg1l9k0j8pqpg0mug/dejirupunefexirakapebako.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/73549583376.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/tapijasinirudawezaponekel.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/zudisilitaximi.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/votapixofotojakudevudek.pdfIn PDF document text
    • https://recrut.com/files/files/wimigolaxamelopifofebal.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/sibipawezizilinaveneleza.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/49473230918.pdfIn PDF document text
    • http://finchamauto.com/pics/88106612762.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904152337320819.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/63158562785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+unblock+a+site+on+chromePDF 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_off0000c3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 17296 bytes
SHA-256: c6b6b3765834c4dcae5ac9a7fff6cae3e8d91d59c40a71aec995fabee23c92e4
font_02_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 11156 bytes
SHA-256: 4eb2c43cc1befcef5f042eb2c69c064084059856caa030bd61f59769364579f6