Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e1e7fbca5ed640…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 11:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ab210d28c792beac49b1f15ce8a5db2 SHA-1: 3703cf0b4274ba5c91e49b5fa1a06ed59d0c1e57 SHA-256: 38e1e7fbca5ed6407724a9bfd7423f720059653771ef7550fef2bebe9ed5c11c
156 Risk Score

Malware Insights

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

The PDF was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'utm_term' parameter in one URL indicates a potential phishing lure related to account security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bualuang101.com/backoffice/upload/files/seberafuvimobuwotadetok.pdf In PDF document text
    • https://mimpi1pusat.com/contents/files/gegizuwuweded.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/bejemefija.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb6923c01---wugezirimoz.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/fipakawidugukilape.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/17476747470.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/duvikok.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/25748173294.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/76912799576.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/jutarimokesojixezixa.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/14180450896.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/56950674364.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/79731988060.pdfIn PDF document text
    • http://vaynhe.com/upload/files/kafesenas.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/migizefixotirakomoxovo.pdfIn PDF document text
    • http://congtyvima.com/images/Download/8514257040.pdfIn PDF document text
    • http://edituj.cz/res/file/40062009699.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/55934413753.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/59590698139.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/takamameziregufituga.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/rutusojigafabipukunan.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/91875349104.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/jasitekeradod.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da27ab1b16---jusijazositoposizuvaja.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/perukiwaz.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613684841582f---deremeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+email+account+password+changePDF 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 18248 bytes
SHA-256: fb4414a3d847fe7001f646af53d184e0423d1af6314fb74ecbd6fb0411edf1b6
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 11128 bytes
SHA-256: 47426278330c298a07b8845cc48b230bfcd2d56d9018df54a1c22ee047dda8e6

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