Malicious PDF — malware analysis report

Static analysis result for SHA-256 53498607ee6a514f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 08:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f85f27226386d0cd15c8e5b99738ccc6 SHA-1: 0fc64fcb9f49e9a06ceb921b3f59b11133565ef4 SHA-256: 53498607ee6a514fde110d7a5cfbb4f8536d1250ee3f444818119a88526e827b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. The SE_CALLBACK_LURE heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may host or link to malicious content, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://goldartline.ua/userfiles/file/razopotopazorasododabegij.pdf In PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/tegona.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/silebut.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f96365257---84271439732.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613efc4809c63---12569994844.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iq9cfgosc65d9p02m26ochr6ec/tereseto.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/15204767977.pdfIn PDF document text
    • http://orthopediedelft.eu/files/fegimesopufe.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/suvojipipavakexamin.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/57519798601.pdfIn PDF document text
    • https://eguiders.com/uploads/viwum.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/23672356653.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/vebigogosobuzo.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/85700965327.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tibesuj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3db23ef7c---66503687270.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/tirodinuxis.pdfIn PDF document text
    • http://gardatrans.com/content/Files/pojujetopukujowi.pdfIn PDF document text
    • http://haki.vn/uploads/files/fukinarizod.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/25640129283.pdfIn PDF document text
    • https://securitydm.net/slicice/file/88861113438.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/39424567832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apps+like+octopus+keymapper+for+androidPDF 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_off0000bc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 19624 bytes
SHA-256: 143ed16934841495107ada74a2322ab6bde6bd78b7eac76d1224f1a4c2ad2545
font_02_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 11068 bytes
SHA-256: 4ba553de18df31001b6eeeadc42085a2498cb6b18ea26f2c88a980b20ac87452

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