Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0200b4e4fc05c7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-24 18:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b76994eaa0ef5275afbe3892a48add2 SHA-1: e82e183da11810cc03be8f03be802eb430d5b250 SHA-256: 1a0200b4e4fc05c79e6302d4e71ceedd3a52bb894f030b3f0cc6ef23413202af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress upload storage, suggesting a technique to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://vico-inmobiliaria.com/ckfinder/userfiles/files/dafuzup.pdf
    • http://sualpturizm.com/userfiles/file/rezogavupexex.pdf
    • http://ky-auto.com/uploadfile/files/98458722121.pdf
    • https://kristinanamaste.eu/files/91009106603.pdf
    • https://soudurelausiere.ca/upload/editor/file/56688538619.pdf
    • http://hndgyl.com/v15/Upload/file/2021922232355118.pdf
    • https://pabxlg.com/userfiles/file/43189748376.pdf
    • https://chennothinterios.com/uploads/file/pefatefagawopuxumuwisiwu.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/puluwedadubufa.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0e017124ac91eea8095f9f931d2376e0/74286245541.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/ninun.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f70246a01---zagagidogetovaruj.pdf
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23228019144.pdf
    • http://fskyok.com/uploadfile/files/punasukibivofaputij.pdf
    • https://mimpi1pusat.com/contents/files/vegim.pdf
    • http://vetcasatenovo.it/userfiles/files/93591113380.pdf
    • http://faw-asia.com/image/upload/files/wunufono.pdf
    • https://ms02bet.com/contents/files/gakitatavipuwa.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/63418162427.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/98226986630.pdf
    • https://ngusacdon.com/upload/files/39049835620.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7d067ffc05baa1d9899c26c3d7f91392/3758005037.pdf
    • http://fskyok.com/uploadfile/files/9164105471.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/tofaxezawirano.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/nivomumuduvepisiwit.pdf
    • http://finara-v.com/file_media/file_image/file/11919487053.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/lovegozopibesekukudide.pdf
    • https://bonekarusa.com/contents/files/26096066291.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cool+games+for+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b97f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB97F 16792 bytes
font_01_sfnt_off0000d191.bin
7b4235f963db7f937a997a3178ac466cbb3b4db9b2beff762dab0753d2243370
pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 18976 bytes
font_02_sfnt_off00010243.bin
509a56a0c0525eb59562eeb2b88b70e281819d2c137bb2915de118b8cbec044d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 10740 bytes