Malicious PDF — malware analysis report

Static analysis result for SHA-256 44de138e940778ef…

MALICIOUS

PDF

89.5 KB Created: 2021-08-01 20:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b33596e4370546ff2a219f43fd9f9893 SHA-1: 232b2466509cd7b0786a28020e7638ac1209ef6a SHA-256: 44de138e940778efc7f6e39e22e2a6daf7d6793a0059c35d94b8acaa9fcaf109
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to distribute malicious content or manipulate search engine results. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b96d4f545---44155106749.pdf In PDF document text
    • http://abpaluso.com/upload/file/sotobukexubukajukoxov.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16074d3ec2aef4---2863821287.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/fufiwiwugixamefab.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/59936806897.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa44c749f---ritiferedipozujo.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/puvowu.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/89663234544.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec887ff5cd5c845b95f593117ac72400/dumixenizoludiw.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c67f776cb---38037856681.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/revivuremexamedini.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/pukexewuza.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093faeec0897---44741437973.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/67563153609.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/31038236945.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/95843026daac6dff53b03d484c531ad2/tufurubumav.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/08910189a5732a828f00c7a1c6074dfe/93549779089.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c7e8d23d2535ff1fc2a2b54d50adb671/94737443859.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/7067480938.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/baminaluvonivuxixal.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/61f2c696168c44245569e3c1a1a90339/vadamifigipefetog.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c578ba5a---fivugokugefuvi.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210726_022953.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ea0ef4b---pididodeduwedipikodokive.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/pokunabive.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/xekamisesufulusukomodi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609219a0ad331---tomefadajuxoxutobinojuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=insidious+3+full+movie+in+hindi+download+freePDF 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_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 10896 bytes
SHA-256: f447c3e0bd8ff213f3512d9f7bd6d9c582c74067136ceea7e7af4b5d3c8e26c9
font_01_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16916 bytes
SHA-256: d2b9a854c1ffd10677eb9289cf4f3900df59ebce8b98a8db479e8f904d9519be
font_02_sfnt_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1