Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae954ef9128ddffb…

MALICIOUS

PDF

88.5 KB Created: 2021-08-26 20:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9721358b04eafc659d58409b8cfc33e4 SHA-1: 89e6d5c9c056bae7bd3df9153d61bea7d04f6223 SHA-256: ae954ef9128ddffb9b5bc695ef6c5f82160d546e3ab08d9747a4569fd5dd9756
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to compromised WordPress upload directories, suggests a phishing or malware distribution scheme. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the document text contains sequences that could be interpreted as commands, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://irlanc.ru/uplcv?utm_term=the+meaning+of+reject PDF link annotation
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8grc4tjo5be87q7vnkrepq53q1/rakikulosedeweti.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nakap.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/giwegeniba.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/vaxaji.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/94799310914.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160744285770bb---51128622032.pdfIn PDF document text
    • https://ghnservizi.com/file/kuraresokatajuzatewikul.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/81470877644.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/98880737686.pdfIn PDF document text
    • https://tepihtrava.rs//files/dolaxidaperavofe.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/65283420685.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ngcmecub21u694u4hn9l3m9g71/44727298679.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/44886436848.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ede74ddf229---verun.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/13362351371.pdfIn PDF document text
    • http://qdcmd.com/data/files/vuxami.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160966e52960c2---6221753161.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6324306d418825c78ec8d2a1b110a31a/76929005748.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161086f5f1af02---xomovatixikoxidaleji.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2cc1ddf8735b67071fc4ce013f72d67c/50955859791.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/nafivilul.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/jetez.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/tikewuluzosi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pugibavav.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-08-13/images/files/nalasimijosa.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/lugagemonowuriminofesedi.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/80227075620.pdfIn PDF document text
    • http://www.playerclub.ro/wp-coIn macro / runtime command snippet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00011fe3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FE3 17548 bytes
SHA-256: 976f4b71cc3f1eac4a939660fb6e5f5838b654ade8bca16bd66e54d4f816f10c
font_00_sfnt_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10664 bytes
SHA-256: 5fffa67e91e49cb787a751e14363dd5faf3a03b9b8e512f4a7f5536a674969c6
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 17592 bytes
SHA-256: 10c0b92f2f876c713aadfee242be70ede09a0268a8d23fa0815a72bdbcad5436
font_03_sfnt_off00013ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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