Malicious PDF — malware analysis report

Static analysis result for SHA-256 320ab77cb80baa3c…

MALICIOUS

PDF

87.1 KB Created: 2021-07-10 00:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22d615d6fe39246ea41cd1fab1b6ae81 SHA-1: 1e3835ee99a851555f805cb9dec0105d64163571 SHA-256: 320ab77cb80baa3c284b83cadad41e7c30cece4aaac94e39f093afcbc0ca0fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609219d032249---bitazobetevijanogadap.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b55be2ab---pitob.pdf
    • http://cke.hk/userfiles/885971081.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608447e63e74b---86347917288.pdf
    • http://statsale.com/data/upload/ck/files/xunodezizexajolutomidufuk.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b552c178e594b11fb2a7e2692d25552c/14473338320.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6034e4s5dansa6vuqs7ikv0up0/gugevetowafide.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cd7c5d505be9a0bf55408ab45c3c5449/17399933328.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/2b43cc8e9c101e21d6f98da12582b470/5771957605.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8n9omkeumu4ch49u0l4mbb6f5r/70834440682.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6ef9bb7b9df9a454f4f4e7e70d5d732f/xijasiwonutuzoxerep.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/9nd0uhga5fl2m3hvl3fihg3cpd/salefepowobofoxagosaju.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/34490627712.pdf
    • http://longthinhphat.net/uploads/files/wofesurovolawaze.pdf
    • http://travelshops.pl/userfiles/file/37398719286.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4c2f96f31d0734f245c9e60e3bb97421/lizewekoxezenufunepuso.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gulugosamirimokomur.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/67787ae0082c07e73d7955501d51d916/10954462789.pdf
    • http://bpsstudio.hu/uploads/78662279878.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5255e79bb8106d79606ae9179a69f5b9/ligasipexefo.pdf
    • https://asset-books.com/userfiles/file/vuxametubofanididor.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076173c4a551---98160444958.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/waxikupaduriwif.pdf
    • http://ibconsulting.it/userfiles/files/gedawutavufajopemimirod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=thinning+of+the+cervix+is+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16792 bytes
font_01_sfnt_off00010abe.bin
29d86c9e31658dcb5619b8b953bd5cc5f937ca782dd6f488cad01fc001dadbfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 10884 bytes
font_02_sfnt_off000123ab.bin
11c36d8d8dd119a9d239a986bdbb497f615cb80bc49eab7ba902c87ec09898d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 16632 bytes