Malicious PDF — malware analysis report

Static analysis result for SHA-256 884f87d3ab7f7749…

MALICIOUS

PDF

97.2 KB Created: 2021-07-13 20:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1967f861491bb01d09594ef2cdc6e18 SHA-1: a13851ff1d752e8d27d1c16bb6770c8d726aaeee SHA-256: 884f87d3ab7f7749ad087cbfaf48e2c02c428b7188574d15a060522952d8fb4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings suggest a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c03724707---xakizosorajowomuga.pdf In PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608119b61451b---88726152409.pdfIn PDF document text
    • http://asfalon.com/__files/file/vonilegabetogufukerem.pdfIn PDF document text
    • http://mqskin.com/luutru/files/43915560112.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cb7dbb05---91436436172.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/82b87ng7o8l7jnkb35nhmbdod1/23088488329.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/70dc988a261127785f6712022476bfb4/dasesobukozifaxajusiv.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c13f5ccde841467a13d4fbc7f7e064c0/76150628870.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/85337138022.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/bolabebilati.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dab0d08b---bajukezuziwovapubaman.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/74499389188.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd06fff0cf2---lusavapelujekowuve.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fusokibiwegalonilifazif.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/66c821b24bab8b222e9fcc67cefb7af3/69987686961.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c86d4a6bf5d---nitoraxededowadinaxu.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/vigixezaxafogovuvuwola.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dd8851fb8---81533868372.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/3399576645.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/napubirogapafuloxu.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/49207722625.pdfIn PDF document text
    • http://sowitech.vn/upload/files/dotinewugojipi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/64872332953.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/ziwilamedebupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=coc+town+hall+13+war+base+linkPDF 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_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10900 bytes
SHA-256: 21682223049f5663d688d5ad0ae1f994f292e9b38802b823be01493aa5f1b3fa
font_01_sfnt_off0001329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 17148 bytes
SHA-256: f72fe2b4dee70a6d59171733082764c123c1905d346d8e307d4ba9943cfa50b0
font_02_sfnt_off00015f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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