Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23fd65664d4b86b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 14:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6896d0ad04e2e5f0cea22d0711ddf036 SHA-1: 2abe2bf223c172d59129517c3c0f2ff1f3b70311 SHA-256: a23fd65664d4b86bb6a02c9fe7d75122f096571cd3c211e131a39f768d5fdd63
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised or disposable hosting, indicating a malicious intent to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mtmnetwork.net/uploadEditor/files/vukizuwitebajawawiw.pdf In PDF document text
    • http://logo4you.dk/userfiles/file/39212033905.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b3641224---63087597186.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/jawoful.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/14814819626.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/nivabosigokowurise.pdfIn PDF document text
    • https://arerp.kr/data/file///nanol.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/dizejawakadelewerijab.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c61ee6c55a6cf13dec8bd8bcd93a6bb0/jixelosexipikiban.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0303g9jimalt3oist750jtuloi/48369914912.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/mefapuzumunop.pdfIn PDF document text
    • http://lovesenergy.nl/file/11534406242.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/asc9nr8tq4fmrg6unl30sjgk66/sepokofadokolate.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/rajogovu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/10952992031.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/14030540551.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/88321350062.pdfIn PDF document text
    • http://czyxchem.com/upload/files/3936234330.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/rukuximan.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/lodazexox.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/salifogaravoviloge.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/rovugibetejasolokales.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/35653198074.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/99762128498.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/37946934396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+write+to+and+from+in+envelopePDF 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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 18344 bytes
SHA-256: a2d2dc6193228fa7fbc42d74997a809155040866471ca457edb95854e0cfa78b
font_02_sfnt_off00013307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13307 10632 bytes
SHA-256: a57fedf3789308dc0c16f2e4af00f81a91ef9b96e724a2ff3fdf4f71edb9ea98

Open this report in the interactive analyzer, or submit your own file for analysis.