Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a4dea2c707bd41…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 21:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26b0b9d62adbf2ddc0f682b6981187d1 SHA-1: 1f9297112ae85cbe28d66115200c4bfab0a5b08c SHA-256: f1a4dea2c707bd4184870b2bd7757c2d1eb5f9700dc41c14516e77eb59607b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://aliglobshop.com/userfiles/file/10244233864.pdf In PDF document text
    • https://pamukoglu.com/userfiles/file/goduxenit.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rumudomebibupi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/86aa40322ab95b75d6fb3b42db3a6683/95788025371.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/32be8de11c432890d5bed2a587e89dcb/jabagedabuwofibo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/9326068435.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/146342157.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6eba33129---fowopodopikiwedixop.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c30c01db615---toronugojuwexa.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/sonujifoxudafa.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/60514531307.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/lakowakoxujazavewagexewo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16103ec7713001---gufasevivekifin.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vorutika.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97876276617.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16271918321386dc386d8124ebcba1.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/11271966789.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/94618867231.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160796fb1738ec---xepifutovufu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161067984208ba---jogirerivedobuvejineleja.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4644e9c7b---82158083373.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/61516951230.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/7219160236.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/fewelibetidelenizod.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/66992087768.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/kaxosesupubusagenabelakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=difusi+dan+osmosis+jurnal+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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 20404 bytes
SHA-256: 8560e669abbd1574c62b3177aa0d10f1d518e308f4ec6cec616853785c60fb5d
font_01_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 10660 bytes
SHA-256: 2a2f24e2e9643934916fd1538659b56d31f6ef0f23a7c7f9de554caab538de03

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