Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f67373308a9279…

MALICIOUS

PDF

90.8 KB Created: 2021-07-16 07:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6f3cf162a078ca054c97f7bb4afe8cdf SHA-1: c974846af78701d8b10737a2e0260c01a112ae76 SHA-256: 56f67373308a92799e1d84d4e985547452eb65c3a2d4f86fab2997657a63cc3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://neonatal-surgery.ru/userfiles/files/wirivizulotisavidomirewom.pdf In PDF document text
    • https://apskarota.org/userfiles/file/42400672726.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/49171540469.pdfIn PDF document text
    • https://afayl.com/userfiles/file/vasirovefe.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c358caa194e---bavisabotib.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-26/20210526093528401820.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/11436033064.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160948ddd9861d---tugujexarubusakujafizijur.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/vijatijizivewexejut.pdfIn PDF document text
    • https://zzhqhi.com/d/files/sogusobuxogido.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/206d63f9df0cbf2000229ec1d4743ca6/69622978182.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/xetinuzamusevos.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c81e241e---kekosed.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/a7l6c181lc6vr034kijq731ol3/9081079195.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/toadde830edpk4cdqsu2ebbqf5/bixuzesifewuluvajitile.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/22659750585.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee085cc82---kixonilidudoli.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/50701479089.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/wativodaselidi.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gowusojawufeve.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf601f24832---44256165042.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/a2hdt66alfg4fnb7kg7ci6i2h8/wesofefufuvoxixov.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da86a11766c---xijemipewaxatepesadug.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/12688919314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=we+had+everything+but+money+pdfPDF 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_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 11144 bytes
SHA-256: 4844fe8a41783967f0990819f141dccdcf09762fe03c353f308abffafcefb83d
font_02_sfnt_off000130fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FD 17192 bytes
SHA-256: 911e1b5799c2027de639088ef2b68b0e774e2d50855907a9d319cf762b69ea6b

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