Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc238d9b7f2b8b0…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 12:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4100e18e77452ce706e5802932eee657 SHA-1: 06bc876dd3845812bf0663f067afee037eaf1bbc SHA-256: 5bc238d9b7f2b8b01975fc8c7c047949155a179a35f4472107f90c3c818100c4
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://coyada.com/up_images/up_images/29219128831.pdf In PDF document text
    • http://flexicourse.cz/res/file/87849684671.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/52457230144.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/wuwelev.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607174485fa88---subofijelikokudupar.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/22696481788.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/f9n2gmf9h3uvq8s8b9prfrmiah/nilugisonixadimon.pdfIn PDF document text
    • https://aashianarealty.com/file/81018372972.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/74508927175.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/27968913596.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l8crrrmq3clfsauvr1iuvqufd9/powepek.pdfIn PDF document text
    • https://capecoralliving.com/media/file/21785095212.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/73368313738.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/34578085862.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f80977a4f928ead9f3544c28132a481b/74386757577.pdfIn PDF document text
    • http://surtek.biz/image/files/20150130_081310.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa476e3196---41027618678.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/xifexodawile.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210805145638.pdfIn PDF document text
    • https://limsurempat.com/contents//files/6447324982.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6325a3c18---kijeluf.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d622b1fed---tijilalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=age+of+exploration+worksheet+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 17064 bytes
SHA-256: b12d94215b6e4db628b33af41d5ac56cc82aa35e7095e1797747f73346dedb19
font_01_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 10896 bytes
SHA-256: 6fe673e8b804efc1a27fca983745a4641d6765a856cc65225953238a9924c266
font_02_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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