Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdc35e8470f65a0…

MALICIOUS

PDF

100.3 KB Created: 2021-09-02 15:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3a6f4bff83d80bf1add9504a97fc88f SHA-1: 48202f0f1f2a72afc9795c9e91f7712391b5dee0 SHA-256: 5bdc35e8470f65a07aaf383420762f15a4d740d0eb16f8906642fbf91a7fddcb
164 Risk Score

Malware Insights

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

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 multiple compromised websites and disposable hosting, likely to obscure the ultimate destination. The presence of a 'download button' lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

Heuristics 7

  • 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.
  • 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://hotelgiottotorino.com/userfiles/files/8149510119.pdf In PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/naxiperovoleferegito.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/56660917111.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc524dc161---bijigekowawavutiberebelul.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b9d8d97a72292b57f3c27ebfb8f9f4d/24452020890.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/dgbf1ip6402ck4aroo4m4as294/92690298666.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/xaxopu.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/45557622830.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/56503119894.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/3410203207.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/14b4fae677861a073947aec1c7b74750/33931080350.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/64576332729.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/nekejafo.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/jusufixube.pdfIn PDF document text
    • http://yoron.net/up/files/pivogogumitizoli.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf19c73b5---xepuzenipuxomemig.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bf468bb70---26239400275.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t6hk3cffa077racvt74g5hevd5/fepetibixuda.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/nabugidevuxula.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/bu2aelr6n3ibfmr009ogv55jcc/88294071370.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/99920485541.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/jamavonik.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f1db2a2286364d005f1c6626e49a1391/saxivugejupajogavide.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/84110215791.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5e887b4a---92000176516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chuyen+hinh+pdf+sang+wordPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 10964 bytes
SHA-256: a40cf00849a48ecfb8b14888d501259a9c0eb45c37ab8f17305fc5be8b4db8e9
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 16244 bytes
SHA-256: 4e90213665fcddf6c3c16cd827236c6257d47025f600483b96c969dad079fba1
font_03_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 26804 bytes
SHA-256: b73d5c35f4873b71eb08894773387fbf22b7c5891d43e689c54ab0eea08d40f7

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