Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c45df997f1f3410…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 14:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccaf539d585efdcce4e4459e45842155 SHA-1: b486c2c6d971a45ebc0a386ec7259f96c1fd5db6 SHA-256: 0c45df997f1f3410e05e6a985c829d2e222585b2c3e1a8378939a73ca3f985d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads, likely for SEO poisoning or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca050bd14e---4511629990.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/af54b69224d767f37d8a8ff66ecf0c0c/97227417229.pdfIn PDF document text
    • http://haki.vn/uploads/files/72069348148.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/paxazakakasukitijowafaf.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86adc4f025---82121329462.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/silofu.pdfIn PDF document text
    • https://aneri12.eu/res/file/tajavure.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608616fee5480---72833331140.pdfIn PDF document text
    • https://europartner2.pl/uploads/20719987124.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/zikerumodeteta.pdfIn PDF document text
    • http://tipresentoio.it/images/file/4806391374.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/xutipovisit.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/84686199455.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/14441722917.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/dalop.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/jurubaginivaxi.pdfIn PDF document text
    • http://alcantara.cz/data/file/xilevoxufijidasitanewi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/45879879781.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/sigubajawobetobuxutubam.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/56053b0592af3b2e5c90ca637433818f/getikisijezi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4e026d06---pigose.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gekusomeweroxesu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077482ee320f---megalolomuwidogulilak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=essay+on+kho+kho+game+in+english+pdfPDF 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_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 19912 bytes
SHA-256: a408312c1efd7305e55a212f879437e7d2cfb70771c31e01ae1037acc873374b
font_01_sfnt_off00013871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15088 10936 bytes
SHA-256: 69a1db5687edb2bb40f01beeadc0f9631e132b901a32a1667a296764f383ac39

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