Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c6388ea08d9753…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 14:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98df970097cf03191e575114e2caa5e8 SHA-1: 49edb92a4485a895c81d34128509f256befa4102 SHA-256: 94c6388ea08d9753420788f19be8ad0a739070f774852b8a6307b7dde17ffcb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external URIs pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=gastroenteritis+for+a+month PDF link annotation
    • https://binarbaidtrading.com/public_html/userfiles/file/91328455537.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/kerelufofolajobudiwarepi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/tdoco5bii8e8umnndedhsfibv2/7925754464.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/26362215107.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1dfffe915ae856957b8e45d150ddddba/jipusikibiji.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609234d9181de---rajujopo.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/fikogetugov.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/pagufewirudugalepi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pazataxebaxe.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/1270174191.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/fabitib.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/eba6489f37f808632bbe1a8d39a11bf4/fabosofebimapulefobobubo.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/28163309432.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3umct7d0mctmdghfdrh0kdtvb1/jaratog.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/554b85c8a0fecd436b078849c8ec8a95/30791513388.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bm4njsj3cu9956ffl05ehrm21/61218424884.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c4fbfb4cc7fdfb32aac5d6a086efc1ca/32791406435.pdfIn PDF document text
    • http://rayer.cn/d/files/97772172872.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bc544a1f833df04826a1be93710854d9/98789049367.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/21dc3d8586b24cafbfc0a1a1c39670ff/24313067963.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/jiwaturipemapo.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/59549472582.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/93944332060.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_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16584 bytes
SHA-256: 18248f2ff05a750e171a46dcd437a9014ba785d192658ad8e91ef8d3f7d1e25e
font_01_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 10472 bytes
SHA-256: 5e9768701e87475bd894ad82293934687d0e3c0d99c6d2dae8814f06565308b0
font_02_sfnt_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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