Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcff4f6a758ba61c…

MALICIOUS

PDF

70.5 KB Created: 2021-10-05 03:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 691446382163a66eb399cdccf635e1ca SHA-1: 3e1f36dbc9ceb36fa22feb5b4e9f1836be136233 SHA-256: fcff4f6a758ba61c15ac1e61e4a08a9c847782ae6dbf756cb34497e2ee8527eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. Although no scripts were explicitly extracted, the PDF structure and malicious indicators suggest it is designed to facilitate phishing or scam operations, likely by directing users to malicious sites or initiating fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 http://koppeika.ru/userfiles/file/padog.pdf In PDF document text
    • https://vnjhanoi.com/upload/files/2765329025.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5o5q935ktset0apoip4tmggngf/73159184870.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/50861356274.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qavkbfgv9do4balllbumtasvup/69095389371.pdfIn PDF document text
    • http://etre-belle.su/images/file/87908454369.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/19031088160.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/76fd21af04d4f27f062a3692b84b7ec1/jedimukebivolu.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/ridopawodipuxud.pdfIn PDF document text
    • http://horvathortho.hu/tmp/63114414790.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/28619960528.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136387a993da---zakude.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/60356234668.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sewirijasipomobepaju.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614116066c1ea---maxarajudusefugukotatus.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/77067053189.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/2953476080.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/fapazufuzeserepekemavov.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/mipabotu.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/24471817445.pdfIn PDF document text
    • http://15441707.com/data/board/file/20211001143900.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/nudupifana.pdfIn PDF document text
    • https://ksuskalology.com/images/file/40314103306.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/mapidijidedoweparukit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=both+upper+and+lowercase+letterPDF 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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 15164 bytes
SHA-256: 446927e4f65c6f882502fc043c297cee650d87e05351867a1adc03230763946c
font_01_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 10756 bytes
SHA-256: 4b079c8612f8abbfc60c0cef95e3986c3bc36bcd2f7fc117886c1c8dc1845279
font_02_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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