Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadebe3aa286a121…

MALICIOUS

PDF

118.1 KB Created: 2021-07-13 09:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5f44528e9ab1868082868a799ceef58 SHA-1: c3f625dd5fc6318fb440919115b67692d1d615e2 SHA-256: aadebe3aa286a1212223047bcc34fb3a9cef8a753c6c5ad5bbab8c91ed7cecc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the nature of the links. The primary attack pattern involves tricking users into visiting these sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753b25ec652---wonarozo.pdf In PDF document text
    • https://jiu-hang.com/upfiles/editor/files/44278482712.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/roburodawifudabotam.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bijawuwiperukituzirobaliz.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/12268547978.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/wapulesobewakonipifuvo.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/be30abf209c04d1116cb9ec3e78cc19b/11724794158.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091c33ca09d7---33369234960.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/lutururexugukoputuf.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b03b426d---47094064333.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/98654348753.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d179cec8---tixajekuzitijo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160897ad3d8b71---38456515046.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5888d99744---99849813820.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/zebat.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073479104488---41058671700.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f55a74fb---nidevezebudidijusik.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/faffe03c3d8b73db83a48f1763dfbbcf/92418977584.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160986be8e091a---nulikawulibixuteg.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/povepok.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4f32i86fkok219cj5m1ucugdsr/xobujitotuj.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/cb719143d1b5522a41a66ff178d6f2f7/40780678212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=2nd+person+narratorPDF 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_off00016c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C32 17804 bytes
SHA-256: f86c3c469466bca15f79416c4d3e507bd5f65ea83a487d27fc34e307034dcb92
font_01_sfnt_off00019a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B275 10272 bytes
SHA-256: 68e495e1862950c2053de7e9ccea914eaa58ec595bcdf038173af979a0655529

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