Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e8f905dcd04747…

MALICIOUS

PDF

69.8 KB Created: 2021-09-14 02:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d36a88908fb99e30f630a9904e61355 SHA-1: 2e0d8e5383255b79e2e153cbfddf3b89b24600dc SHA-256: 82e8f905dcd04747f0a32c84c6407bf4fa83dbe628ad4aa358ee1a4225719667
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content, possibly for game downloads as indicated by the 'tekken 6 game download' UTM parameter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://life-homeshop.com/asset/uploads/files/72690443851.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ead4d0fa---gusogofaz.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/siwapunapuwuzugun.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/61256374720.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/70069327536.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vezerome.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/33232633473.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/21162865987.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/77488577332.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6139894a38052.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/gisizapuwipezux.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/69211593002.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/luluduganixasoler.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/tasidikorod.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/46nfu82slho9ga31g5oitf24um/sukefifuguxojulabevoxatof.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/pixobabamonixi.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/91562688772.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139c695a804b---26914643756.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/11/file/15234627756.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6c4d9fd0f3663825087924b21debb557/2669551337.pdfIn PDF document text
    • https://durimawar.com/contents/files/tuxesa.pdfIn PDF document text
    • https://ms01bet.net/contents/files/ginodixe.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/sigebejudiwuditetemowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tekken+6+game+download+for+androidPDF 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_off0000b31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 15032 bytes
SHA-256: a72fc62a8450fa4b12df9ea84601fc546a0e23e5d6960b5a3f25dcdefabcb4dd
font_02_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10740 bytes
SHA-256: 74269c435183f61664785a3273c8abcb92d081b1062a1c0b110829cc3253f0bf