Malicious PDF — malware analysis report

Static analysis result for SHA-256 a489880874b20512…

MALICIOUS

PDF

95.1 KB Created: 2021-09-05 00:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96a9928a95a63c4110b23c997faf63de SHA-1: eb4206eff897489e5e48d819b04aa63e25dfadaa SHA-256: a489880874b2051278ebd527f7bbbd5dd0459367706765e02a842611bd4e2aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/t6b11ffivmei41v5aksqa79s97/lukuxodexedumixadigifas.pdf In PDF document text
    • https://songhong.info/userfiles/file/kigopaxadivu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844607dc531---lozixabe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608800571b647---juwofaxukeraliso.pdfIn PDF document text
    • http://iphysiology.ru/upload/53976568190.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/sqficie62m78r64vlfgkjb94ru/4488709604.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/fejejuvabavowegelibowa.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/wupezakulefozuxozap.pdfIn PDF document text
    • https://e-midas.ro/files/file/kuwaferemufewuronigisi.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/49281678156.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/82e2f6702e402094d24c8ad31d3911e9/59611459108.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/31405812778.pdfIn PDF document text
    • http://adveotec.com/img/file/vutidopu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97d9650cf---95071101483.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/42425057212.pdfIn PDF document text
    • http://sinostandards.net/upload/files/78680686343.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf77cc308---devunobezivejabuxun.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/irnujglgp8q2nvp2ketmmv7str/nugutejaxixumaxiwuxadozi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97adce2ff2---39754973615.pdfIn PDF document text
    • https://wildnaturetravel.com/File/64870265622.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e5c8ef6a8fc8b546772c69d1ceeb9077/pofujobefakamomob.pdfIn PDF document text
    • https://incense888.com/uploads/files/202108310448477243.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/kupewupevutuzafofoviraxaf.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090531f9b674---misebivegunuvax.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036cfbae640---fawikozajitopitijeduperux.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/dasujebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=whirlpool+microwave+manual+wml55011hsPDF 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_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 20508 bytes
SHA-256: fad67e8d6e69406b31c1dc3d07b7803dde11bfff5f15a93069f1d02cc204e493
font_01_sfnt_off00013d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D38 11092 bytes
SHA-256: 2f37b1f5b063a5dd202d0dd650d34f0fa29e9180140b2460df789477cead52b2
font_02_sfnt_off000156fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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