Malicious PDF — malware analysis report

Static analysis result for SHA-256 496809e080f3ea8d…

MALICIOUS

PDF

94.3 KB Created: 2021-07-27 21:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6da161dd05d657d5be62b5a89a489535 SHA-1: 5c7141e33d65c71e3f3e7ea3d6c806191898e44c SHA-256: 496809e080f3ea8d3b49cc8fbc6386ed1ab33faa80a1f54beeea7e698e393f5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to multiple distinct hosts. The PDF likely uses JavaScript to execute malicious actions and the link farm serves as a redirection mechanism to further stages or phishing content. The presence of multiple URLs hosted on what appear to be compromised WordPress sites and disposable domains suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://empezo.xyz/js/ckfinder/userfiles/files/jugidulijefegufe.pdf In PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7252c8689f2164894031afd8feac6e00/16823768778.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5aab4211df714372c6d9236ff5d9dadb/43825069631.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/katoxavigawuwex.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37d365600---wadadupasixura.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jidugukik.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/gegix.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/kedesinevaxiworajibebe.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/74029999212.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/luwijor.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/80183621789.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e559d3133826711c30b4e1d5cc676e50/zevudut.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab176b46a0---lesupominexaxemojiz.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099837544608---bopugisimaxaladexifoziror.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747405805c8---jetokitajekupefo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d38700b6ca7250366ae4befcb1f57d23/76446426195.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5508012f43a3ee6ddf7f73a765f86b2e/16645457291.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fd5398405a5476222d0de0298ec33e5c/tibexuku.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/gabebada.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/82741405835.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088834f5a75e---xuxafeduvawijezaxafit.pdfIn PDF document text
    • http://changecn.net/ckupload/files/dipawasado.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/58599079703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bomfunk+mc%27s+something+going+on+%D0%BF%D0%B5%D1%80%D0%B5%D0%B2%D0%BE%D0%B4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fbb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFBB3 18412 bytes
SHA-256: 61978381188967ccb46ddeb69258ebc501b09b5672495cb42693da66806c4f12
font_00_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 11472 bytes
SHA-256: 0108c5bf4ecbbd1daa53ead226e28042624dbd5a03dddd5fa83d2a5f090781e0
font_02_sfnt_off0001194f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 22396 bytes
SHA-256: 646bc8860aa1530fac7cb910c1805ea141e1ff5f6a300706b686943936997288
font_03_sfnt_off0001502c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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