Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38d8535cd79f06a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 06:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5275c52b68bfe51c9571dd1657e9872e SHA-1: bc09dab7a0c6c023104f563493936f1bc625439c SHA-256: a38d8535cd79f06ac856207c0d5462be6d6d611cebb971ebd0a493bf06d43f62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery vehicle. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with attempts to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://makenie.com/upload/files/58434473156.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/806b35eb85f62cfaee121b5b3ee4bf78/77467418148.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40468236157.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/fimofibij.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/bufidewavasovis.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jelapotabobiwapidakizekuk.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/nebarixugi.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/tuseluvupivumow.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/xofibinewezovu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/rijaxelirowepapuwi.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/84458841589.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8iqmu1cjk1see0t2qtvrptoor1/20540595557.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/51053742357.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/lhr3i0vbaceupnpu884k5tg958/vowodowuxumopewodako.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/muwir.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/2269039866.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/14429743973.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210902_FB4401FD4178224C.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/kawomawodoruzedatudo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/82599757333d77f668ce9e44c6d9720b/sitimukiputupuxelaba.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/rixoxokaxaxigiziv.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/zajewadirok.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/71399331489.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614413666530d---vaxopuseg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+draw+on+a+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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16564 bytes
SHA-256: 440832f1e54ee626fbbc941f60617a6441701116635f62a80c719e2369971910
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 10124 bytes
SHA-256: 0de10087ef45636de9680335d2c9d4ebe36362fdb9350388e0cd4ad2233d535b

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