Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b056a7e0766399…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 07:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79e1bb55138aded0e5a7ab41ea6495e4 SHA-1: 29fdef10aab3cc123c918c0e655ec99a760651b2 SHA-256: a3b056a7e0766399d9f683cf21556c80d272b0bee8185476e86ba5b318f19bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using link farms on potentially compromised or disposable hosting to distribute malware. No scripts were extracted, but the overall pattern suggests a phishing lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=invitation+acceptance+letter PDF link annotation
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f256504c---80839050039.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/takafipafopojaf.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/feruruzugidilibuxoxejapaw.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612f1e1e6a64f---13494206120.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed0cdaddf---37881360899.pdfIn PDF document text
    • https://izometal.net/mm/file/12947927931.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/62403584316.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/jofip.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/wozewuxopufisixebobujiwi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7d24d9254aca9256d943e63d289dcbaf/10236777435.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/tidegerojipuxanureme.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/63461748871.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/xalewodexukabenapelixap.pdfIn PDF document text
    • http://mylodge-naoshima.com/vabulebakibibugiz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ded4ae39---16407812029.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/67077791909.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/kiderixuj.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/lipujumoxobifibup.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/nipudadasexuvepasuga.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/58567754639.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/16984161106.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/87230508389.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/fosamevaderunasajisu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/59248326740.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_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 17096 bytes
SHA-256: b37a9539fd7bb4c5626f7567004a8cf13741a3b801bec26497f54baab965bf5a
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 10216 bytes
SHA-256: 4b8eb9ec4bb2521d33a7be75eda0e988eab294d7e969de1de19ba8a21633d254
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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