Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ba293f09b8b61a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-29 09:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b5c237b19bf9c4021b13e5183e35a41 SHA-1: 3a92f069adb5cde80334a23ea4dfd999656a9f96 SHA-256: 14ba293f09b8b61a39eb8e778b7f74c1968b6091244eb5c0c41da487f1f0c926
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://protectakoteasia.com/ckfinder/userfiles/files/42806349688.pdf
    • https://uzunlarpeynir.com/dursun/upload/files/63244552634.pdf
    • http://www.39koratmachinery.com/file_upload/files/79515234384.pdf
    • https://rapn.ru/ckfinder/userfiles/files/44553165359.pdf
    • https://etadelloro.it/images/file/tapuwafipixitokure.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/zigilagisipalebelikidabun.pdf
    • https://romalasergroup.com/userfiles/files/ponotinisosojeriz.pdf
    • https://sukienmiennam.com/userupload/files/ziwebomagekutedilunileb.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de453af203---miwibuzigipapodisotaxet.pdf
    • https://davaocarrental.com/images/file/19005529942.pdf
    • http://uhy-th.com/image/upload/files/70485921848.pdf
    • http://flywings.sk/UserFiles/file/16716638109.pdf
    • http://dgone.kr/userfiles/file/20210926111531.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/wawomotugadovibidivazojar.pdf
    • https://catbasailing.com/upload/fck/file/84093319821.pdf
    • http://angerdress.store/ckfinder/userfiles/files/jedabigixebirazobebi.pdf
    • https://sausalito.com/wysiwygfiles/file/51238640271.pdf
    • http://hoanggiaphatland.com/uploads/image/files/lutaliwafemuxixedelaru.pdf
    • http://phongbepfagor.com/userfiles/file/vogogujujolawoveveduno.pdf
    • https://advantagelic.com/singhania/downloads/file/28227823161.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe283f402d---55412441874.pdf
    • https://eurotig.ro/file/mikewoz.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c53ee3dc4---gakuwugurop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=winstar+android+mobile+price+in+bangladesh
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b21b.bin
fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 16244 bytes
font_01_sfnt_off0000c809.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 16792 bytes
font_02_sfnt_off0000e01b.bin
d2dd3f3457db93bc71371cec670c61aae966299b5dd898b870280fe07fc252b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 17964 bytes
font_03_sfnt_off00010df0.bin
5a6797ea4c51be5f756bce5d440f2bf56ec04c624fbeeaec7d6387db396bd27b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 11092 bytes