Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31ed0c7654a481b…

MALICIOUS

PDF

104.2 KB Created: 2021-06-26 20:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 10e3e5de8fcf934d665363a521c2ef0f SHA-1: ffde38bfbdad7d7a539f4d3321cbc4ceea18437c SHA-256: d31ed0c7654a481b0150bf4b5b53a36a13f424f98caab09c444eb981ee6e8e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://coffee33.ru/archive/file/tiwetikozixonuwariwimiwox.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f51cac7d9---fivijugunod.pdfIn PDF document text
    • https://makenie.com/upload/files/75514354322.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/lizigas.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/e4b4c765a4fc41c919194a657f5de642/34920646358.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/cb43c1a6e1a86f88bcf01012e529ac66/joxobuzovozexix.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qgque9fsc67n06mdv1eer6iq3q/wizemerufiwiwidujokir.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13d1beb547---fakewatupiwi.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf878440f6f---kasefapun.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd33b9aca---bozexasoni.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/suwuzujefokaloxakuleka.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8dad48de9f2b2a04239d662d92d4e7c1/zijowesufoj.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/nuvexezonujusolanalobari.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a220ba2b577---fobem.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d77d57362---xodoga.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/96914216122.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ecb2a6e37e8e504ecbbd3601dff47860/wujisakuxosanepibibegag.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/48241175044.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9jvvuh96bvfoemco0lh8oorboq/xerenefobujimolugavev.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/30825350360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=speaking+part+2+sample+answersPDF 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_off000137ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 10848 bytes
SHA-256: ff987ab9b4b7ad81d107703973486bc6562ba9522beed262bb6a526448c387ef
font_01_sfnt_off0001510d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510D 16608 bytes
SHA-256: b4ad2ef7f2a0fdc06db9e325afe9fa6bebc5aa0cb3afe2c04c6e2fae19fb5c8e
font_02_sfnt_off00017bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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