Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d853395ee9e7e4…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 02:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c370a5e471940c8d7aa9028a1e46d398 SHA-1: ddf7d1e418b9a562fbc833643d8df0bf9083f997 SHA-256: 93d853395ee9e7e4ae53fc0453856d62bb963465bdba256a150aa7aab587219f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and potentially disposable hosting, suggesting it's used for distributing further malicious content or phishing. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick the user into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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.
  • 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://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3gbs0n91jbnmqtjr8kapbv77on/82851011730.pdf In PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/pagudikezoxudafikotem.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/81223070690.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/67387842529.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/46104418335.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/30960172220.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109081711154208.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/44018938886.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/81827884088.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d93f261ea---xovabilumebifarevosawexek.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/3185025533.pdfIn PDF document text
    • http://askort.pl/Upload/file/pubutazejijusonifuj.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/1670780008.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/69834655644.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/9916124558.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/vapofasabifux.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/16808285881.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zegedotivupapavebirasejon.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/jixojexinumoxapuzobade.pdfIn PDF document text
    • http://arsvet.ru/img/upload/giwesulibofaleleseju.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/lukanepalexugikadur.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///88504375105.pdfIn PDF document text
    • http://kodemari.info/data/files/66464013214.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7pefmc231r02fjrh4kcm4ao8e2/bolefoluder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=youtube+video+downloader+app+for+android+free+downloadPDF 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_off0000bd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD52 16824 bytes
SHA-256: c88a506e991a0ab7bd2797c9b18484b20fd70b4c7ac21eb25ac598609c207a33
font_01_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 10700 bytes
SHA-256: 66e549d909833ab5beaa4d4c130e1f3278a196c6ec1cf77898c89cd963a281f1