Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5a0dffd24cb4f8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 01:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b00e2d8db258084366405df514375fb SHA-1: 4d61a975016c8636d71ab9381f6760fa1f92e5b7 SHA-256: ba5a0dffd24cb4f83d61841282a85e050a01f026f13000c66cba0806d1adb43e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://trubaopt.ru/content/file/terunabosariregami.pdf In PDF document text
    • http://thebrownbag.vn/upload/files/mopenopezuse.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210907_C1FD4B1D35D260EC.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/96880240509.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e0e5d8721484cb002f56ed9ec93d280/kejuxina.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/10976861619.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/vokuduxefotabo.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/45886383879.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/miremom.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/40274070315.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/zutiwivodulevup.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/tulikedadoxuf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4550d8fdd634ae767b32d8b15d98a7c/timenomotubowezulorep.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/mosebokufuvofepi.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/22436857423.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/veroxolijewaxaluwilikebo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb0919729---vusumajexuzararumuxava.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/37515059939.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/50849209779.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/nukidebuwanafaguv.pdfIn PDF document text
    • http://atya.eu/files/file/65789323274.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3651016969d85a3ed1469cffec00b374/98169263991.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/20359094860.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/bubisufaxasajawapora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=qr+code+generator+offline+softwarePDF 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_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 10796 bytes
SHA-256: 0a1bfde4a42d85d20c8e105cba1156c2939e9fe3a9c767fc3ae1788922241e02
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 17776 bytes
SHA-256: e5b0b1e4b817870f94d7e59d31e80defd9083f71440fa13b35089f78f46a29ef
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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