Malicious PDF — malware analysis report

Static analysis result for SHA-256 d154d847bf6376c2…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 16:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a85bea6e2a03531180098fad89c6be53 SHA-1: 01d0efb72a9f92883cf986e350cd16066c85e551 SHA-256: d154d847bf6376c27e35ce0832fc55760a160d6940f82495adfc49a48604a86d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--vb0b83rba554gca.kr/page_data/file/20210506084659.pdf In PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/zeduripejiravoj.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j2cmtpikgo0m5e1ecg22grc8e4/34446101634.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/80291635421.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/75frdoul9hb32vjb4omn35bnpj/11059567380.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/20029117470.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bupnfaf4e02f5ivmtdcpi92sr7/6154490590.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fab7a6948f37be2ef4b9b432e50d29f/30351957572.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608b823061a07---rozemuxetiximibupevog.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b1db1019e1a911da73c04a2c0d347eed/weziwefu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0cf6af34---kiwogobukajisino.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/74100015580.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab6ada72fe---43467842489.pdfIn PDF document text
    • https://tipresentoio.it/images/file/90663780335.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/sodufipow.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe82ce5bf---towemerodavudija.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/bujove.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/3adc01fcfac94fab7d9d8807c215c5f2/43546252389.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8574c291e6a7b7e244fe9d8b3216337a/72150291302.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa2b14f98---rafopad.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7409517e---15433535343.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d619d104---xarukojiturogemerivo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aaf95703513---35278214835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=coefficient+of+variation+examplePDF 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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 10672 bytes
SHA-256: 06a9b0d19fcce8fe811385a658145b34f9ebd0bb9c8826331f1658dfa15cfb23
font_01_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 17636 bytes
SHA-256: 6c855632fc22c8f6fbbfcf741e374849c71d97b3ce1c72891cd89e4d2a44271d
font_02_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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