Malicious PDF — malware analysis report

Static analysis result for SHA-256 454bc7befeb2e653…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 03:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c056822bbe15b65151fffb72717dd68 SHA-1: a45664e1d6a1822ae8f07f372af98b586fe56724 SHA-256: 454bc7befeb2e65327b5fd9a6ca7b117bb602607f15a74deee5e158fc4db01a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, indicating 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 heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=iconx+2018+manual PDF link annotation
    • http://global-insurance-broker.de/downloads/gazuladusadiluje.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba391d35b---22754847694.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4b1f91e8d46eeb67a355592d77e2978c/nebuvufotijilopumup.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/75944808584.pdfIn PDF document text
    • http://go-forum.cn/upload/files/60738297935.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/14395211780.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/12887795301.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bazoguxu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/37117493729.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/tilupot.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7a22ecaf2a85cab73bb79111fb4b38d3/vutikipu.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/82448480650.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/79010594541.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/merufat.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/wisusogefasujenowudutuk.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b5tdspjm02828dsqau9qmik84r/74078387055.pdfIn PDF document text
    • https://southafricapools.com/contents/files/91588321804.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/br32s9s7lajt3jvce08hhfclri/geligexilufezufujo.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210805072822.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/62848608581.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/aa81794c6e9c9337b5d12be7b995305e/79543133974.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fe87b79821be96bdbe78708c76ada69a/95467665329.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/p12ivp7luve7lp28ili4mpf9i3/93934162061.pdfIn PDF document text
    • http://domplus.su/userfiles/files/waguvadutuvup.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fa4f2c062---samiroxififujotemu.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/xaxowovejumi.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_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 10456 bytes
SHA-256: 838a5b427940864d7590b37eb45db897f74957073096578fe7dadfe7e32b9a92
font_01_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 18964 bytes
SHA-256: 234cf3b5b0da3e5f02456c722aa3fc1d3eddd64614160bd35cbbc469eb550ea5

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