Malicious PDF — malware analysis report

Static analysis result for SHA-256 30023dc65bacf2d3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 17:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: febf7454c3283e9bf1a28736fcccb45c SHA-1: d9f378df90d96d271ea3ad45a23acfe87ff6a110 SHA-256: 30023dc65bacf2d3ea0cee0c3ace1678c2071f0d5e73e71cd71cb5ff06407ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=crazy+bartender+apk PDF link annotation
    • http://megaprestige.ru/uploads/files/vaxazil.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/25922755178.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19ed620ca---dexugizotuwodowigatubudox.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/70115302865.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7f8ee4d367364eaf747627961fab3ee1/vubopikux.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/73940137970.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/91444175867.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/vatodu.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/wuvupidafadewufobigogo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/im9dvki98ss19sfg4mehel7nv7/65237462901.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/73596797627.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132593f2d741---popuwevomekok.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/sokotutakumivumipodosu.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/71531265951.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/73076323587.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/nidubagijuvopazezaku.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/sogokixeburelenewime.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/53278865511.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/neduwujikulo.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/zuzezaxuwetikabazarijemun.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1cb6777181b7529a9b517de78d7d288a/79682092576.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090716492491.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/pitosi.pdfIn PDF document text
    • 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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 10396 bytes
SHA-256: c23db8ff102976fc59476fb7f48fe6bccd0fe1577072c49d541165192cd3ade3
font_01_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 18844 bytes
SHA-256: 3442ee75d01019db3047a379873406fa66ce782e4f6c078094758afdfc1d8ef5
font_02_sfnt_off00011a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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