Malicious PDF — malware analysis report

Static analysis result for SHA-256 11636727e80734ba…

MALICIOUS

PDF

75.9 KB Created: 2021-06-27 00:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1166f66313e0e79e00e314682974edc SHA-1: 48c6bff78f1cd1ba3059d2899a3d9b798a280876 SHA-256: 11636727e80734baca102a181e6ab3413ddfd62730f33451751089cdf444d8b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and the nature of the links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=state+house+live PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3d3bd4ba90479793a2fd3ad9c50812d7/82820091067.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/31207021123.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/zenazu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02acd33b7---xoxeje.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/36797004345.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3c0f0e1e3f51419c92b8d74de96b27b/lafinevuzojixuz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ebe1dcb603dbeaf07332b78a1805754d/59432759124.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2suluc46rogqqjlk6kg3bndbii/29054122497.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/60414101144.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c92aa85946f---61933367473.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/supepipon.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3444ec3618---96788783462.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/59921892419.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/69526350015.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/30122460624.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/b75fa9839dd738da1f60c7a4f7a17c47/71568356223.pdfIn PDF document text
    • https://heyratacademy.ir/file/87916979949.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/kasovabagoxipirilotum.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/88940442407.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/96512834096.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/322985828ae4d4fba5818953c02cd5bb/kimevurora.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/e4tfm9ib3lr17tciceg351mt81/10151797589.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc560b6d52c---64526995063.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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 16172 bytes
SHA-256: 9863f6829416d9731403fc0fedcca9b84298150596c7afeec1aab765b542a6bb
font_02_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 10240 bytes
SHA-256: 5d23297cb50ee290b4b568b4d56de0c7611d024280b98ed0d8eb95415c1f310c

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