Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a30861ae0a8ef06…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 18:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92ba8b97a88ebf99b535ac93572ae4c1 SHA-1: e94cc887df0882a6a4159944f0f01e8557e8a5b3 SHA-256: 2a30861ae0a8ef068c5e49da249a7b2a18c605e8b6868ca9c5d199b2538b41bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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 http://owv-sad.de/userfiles/files/kimojadinowepuzinezod.pdf In PDF document text
    • http://ibb-online.ru/f/file/tibogonugewuwafox.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///xawakologupeji.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be44f44040---fajovete.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/dewepevusenori.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/17135640402.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210916185904_rfd61k.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/dipitifejuwimisikuwidode.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61354ECCD19D9.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/fodamewejawogugabofot.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/dijonipavarafinufuwusu.pdfIn PDF document text
    • https://hirurgija.me/files/67649103533.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/jojategorisiz.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7b5c5804256fad42c8d5bf6f83e595d2/nenojapagaserojuz.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/wemuzelobiwavimutur.pdfIn PDF document text
    • http://maidichike.com/upload/files/79905610012.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/zisumuxebadawav.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/ximogekujagazanodisela.pdfIn PDF document text
    • http://www.moyekolodin.com/files/48834897240.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/93951571068.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///xuveresanakuwebaloje.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/wafesigug.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/turotasadozilemi.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/gokexurejiralalemiwiz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301c987ab79---zutavatakifomafojen.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/makoxuxerigobofukotakijak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=recuperar+archivos+borrados+android+desde+pcPDF 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 19108 bytes
SHA-256: b2a8a9687280da92fb9b69dcc7c488ff71d7093ff55c9e2a9576426e78089788
font_02_sfnt_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 10816 bytes
SHA-256: 21768c12bfde075b44c2bd946308d3b37d0f7422eb1a6f25b665f8abb7d136cb

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