Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57e657c9b588197…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 15:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b10b66f14f2b1d3efccd1400df71b073 SHA-1: 28d80b84aaf4a72984ecb9683e9e5229df31dcf1 SHA-256: a57e657c9b588197063519ff177133759e8ca159bd3988bd9df74e69bc67f4cc
204 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of social engineering attacks like ClickFix. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious content. Although no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soojuspilt.ee/files/file/muvupebibede.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/599bd1c50b15be3039c1d2a230c30ea2/88501202680.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/biwepexaref.pdfIn PDF document text
    • https://jagominum.com/contents/files/kimukilak.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/89980813497.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/detazulebibu.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/tupudoxegavinepisupolos.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/50719067916.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097cc031d6---fuwuwuku.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/dojome.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/kagamerozizirife.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/lekubomebimujuf.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tukus.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/xigupo.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/wikapijot.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8g4b3t47le9nat70pvrm27vlgo/25997195710.pdfIn PDF document text
    • https://umutfm.com/resimler/files/fatenezovegonuwolawepiges.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/16124178680.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/regitiveboresej.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/5175471735.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/69743719484.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/67835906622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=language+pack+for+androidPDF 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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10632 bytes
SHA-256: e408ea3e7cdcf050ff741c65753ad096a38a5d47b5489ab06a93d210751ab527
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 17188 bytes
SHA-256: 3901ba35b79b5a82099906491d5923b8203474058de692bbf75c98fa4e214c60
font_02_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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