Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfb075b1039169a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 00:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3858cda1479b0a949664625e2edff48 SHA-1: 9b202d7b6a51cdb1d928404bb2cfd8147997eb60 SHA-256: dcfb075b1039169a28ab841b9bfe0952e8e58b8818c00b17f42f02317158955f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.jaegeraviation.com/ckfinder/userfiles/files/sexukirizow.pdf In PDF document text
    • http://klm-co.ru/foto/ck/files/96982455583.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/41443127710.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/97439632933.pdfIn PDF document text
    • http://chromavials.com/d/files/62178383787.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d11084556d6788106f6fd200ccbe3245/fegujavagonibejonofami.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/74412622631.pdfIn PDF document text
    • https://protrialse.eu/files/files/moxiganiganopavemu.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/89030846758.pdfIn PDF document text
    • http://vce34.ru/attachments/file/vojozexagemufabelet.pdfIn PDF document text
    • http://idcla.net/upload/files/genazusadudokiz.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/88651674132.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/60643390832.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/gopusibakizojekomuka.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/kuvalisezepafi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ad292589---96283778228.pdfIn PDF document text
    • https://airxps.com/userfiles/files/zaxibe.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/kisizi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa7f51999---3847430546.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/tirevof.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/goxetamavopilepibotata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=circumference+of+a+sector+formulaPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tegaxepobuzasiw.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_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 10628 bytes
SHA-256: ccbb5bc28933357e7dc786c8348fb4b27941d7cf326a387b4bd0879955548a05
font_01_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 20492 bytes
SHA-256: fa4a31f6c5100d52ad7c2ff57f2f55a0542d497233afb38406e79b29fd5d9273
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1