Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf634c8854730b1b…

MALICIOUS

PDF

98.1 KB Created: 2021-06-19 18:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b95f00e1e559a49c2d40dd44b5c65ae5 SHA-1: 0242ba311b75b738cd6749c122263532e4a9b733 SHA-256: cf634c8854730b1be23ed7382df92aa7b609ec11bab3cff7e127d609f65abc52
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on compromised WordPress sites. The document body, though heavily obfuscated, contains text suggesting a lure for downloading a PDF, likely a phishing or malware distribution attempt. The numerous embedded URLs point to various domains, many of which are associated with compromised CMS uploads, indicating a distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607765c6762c0---11052295588.pdf In PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db45bcd763---89173903428.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac51408a7---zixiwofizumivogekal.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b898099---76869136583.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ae099b0c6fd87469a19f430059657570/bixom.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca110edd8---39647730736.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7c202a60fe4f3abda45a306e6158cbdd/buneridijoponajude.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/fa57412e1892643a39effbc9d8237d7d/sekiw.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/45347949401.pdfIn PDF document text
    • https://mfdesign.hu/files/file/gebaxoxosebogodixafun.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/kusimowuxibebuwip.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9r0genqtpme15cq7h4q7oc7mo1/durojopojepakulim.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/tazariwusa.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/97104311533.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf2e1417a---pujag.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/h9omg02kiqb5p9mj5rd7jufkar/13462770495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=10th+maths+guide+new+syllabus+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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 5792 bytes
SHA-256: b6a5f98d463f59c0afcb9479f44bf93a49d119f3f2c1fc5f9591dbe53bb99ae1
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 20816 bytes
SHA-256: 31bed3d8fb28c91a33ff3de41d9ea85bd8a6d0de70cf5751f440c5466978cacd
font_02_sfnt_off00013e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E89 10716 bytes
SHA-256: 871cc51c9ca4a34fa05939e197c81e7e3f8284f03143bf233462add6410f154d
font_03_sfnt_off00016360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16360 16164 bytes
SHA-256: f77a650bf30fac1f1cb205f4d991494459caf62489144cf2911e6fb21caae358

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