Malicious PDF — malware analysis report

Static analysis result for SHA-256 f239cc61101b4d6c…

MALICIOUS

PDF

140.7 KB Created: 2021-08-19 19:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8469307775a5e328f6647d9ebf468bb7 SHA-1: 1db77e06567de27bab3e739cc74f97dc82eda9e1 SHA-256: f239cc61101b4d6c6649b2d2babb852c9be96f44df1a9df68419fde7cda72c5d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The embedded URLs and the heuristic findings strongly suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a736537ad---84274834295.pdf In PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/94004464504.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rac6cdmmg9ojmm81dv45cumal4/vezupisasojozuvepaxaji.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7c70667852a8ace231e5b0fde82e1994/beguzipibozawulelegakot.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/45084754393.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/86513858908.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/66464095882.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9e3e8ec2---wobupidobapadajitulebi.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/04f062325c037a98b24003efc8f788c5/95398187981.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1b2bb3f4702aa6c24ef59efee8443878/zutezoriladafuku.pdfIn PDF document text
    • http://cartopack.com/Images/file/93080448322.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/98726089044.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/705bf26628cd99711cfeccf2ba746bec/22646392547.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aa02d309e45e34f92d87a9146265999d/kosovifog.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/40087001273.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/jisudekumajojitip.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vjouubj0tpbln6mirejv4tnl51/rubogu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9258963ac---wepamofezususaxuke.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/97871825803.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/60227567129.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/33a8b7557750d599f09a2f0f34918876/49128397148.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaf590c594---zefupoxikagipizirofove.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/navuruzuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fundamentos+de+ortopedia+e+traumatologia+volpon+pdf+downloadPDF 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_off0001bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBC6 21216 bytes
SHA-256: 98f33fa5fc45cef9bb75ecdd006a2bb606dcf0754c7db8d8013a73e3bdc9c885
font_01_sfnt_off0001f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2082D 11072 bytes
SHA-256: 710fb8df8c5fda929813336c96a9654bcaef1e4bd2ca2219c5f52303a2764862

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