Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8343a803c81957…

MALICIOUS

PDF

85.8 KB Created: 2021-10-11 13:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: de6bb8a8231daa1965860eb5cdb543de SHA-1: 13620547fceed5e04a7d519cf9f54743d30a094d SHA-256: 4c8343a803c81957667b1ad14ff80d6de29239f51cbb36ea6d29a65c21985d45
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be disposable or compromised, suggesting a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic indicates social engineering tactics designed to trick users into executing commands, further supporting a malicious intent. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://kpotplace.com/uploads/files/wonutuverikur.pdf In PDF document text
    • http://namngonviet.vn/user-/files/94694460002.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/45663810586.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/44486023251.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/wakizowoninogiw.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/militifosi.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/20462979862.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/mufaritimavuluv.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/68996506879.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/vilusixeremimon.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/46744579066.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/maem15jsk9c8666cvon8irfpaf/19137164131.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/duzobarizukoberup.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6b7f05bd6---ruwenadoriteni.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/55065738967.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/461ca0ef9575f3d6a63980788ee5a444/kunusojuxosufixa.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/genobiwojisivifutadi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/9238754258.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/lirujozigevikutadasiv.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/dokebexasojokaderu.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/87047371767.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/37648491985.pdfIn PDF document text
    • https://mattress-leader.com/media/54109017783.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/tinene.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=how+to+crop+pdf+file+in+laptopPDF 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_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 17772 bytes
SHA-256: 072d6e62391ac9d203ac01d0a9dde7c9179baa2d60f06ea129f4281f9a6a626d
font_02_sfnt_off00013133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13133 10524 bytes
SHA-256: b9506a8ea9a299d01afdaff54635142040c5bc39109c9a64c4d5cee53a98babd

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