Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e1979d4d5fbd72…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 18:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f517e97f0544b94d1aab487f02601f3a SHA-1: 2898e9a779cf708bb740859d35424699e1094d7e SHA-256: 91e1979d4d5fbd72709cdba23633206b9418ef861cfb3f8a8254bc5a26c786dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://infrive.ru/uplcv?utm_term=the+big+four+agenda+pdf PDF link annotation
    • https://digireg.se/upload/notapekori.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc0e2c2e1---41295151421.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160fade0e8ea4c---pirepogezasozuzezefu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fdca710e3c1---20209457673.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98e7d1e89---83806885185.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/xowijajutesinotefizobut.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/61942269649.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/68224987362.pdfIn PDF document text
    • https://signika.pl/Upload/file/daladuvibapageren.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/10799853802.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c2950e75e---63632807512.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/rixoliperalebinixoxoka.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lixanivalakuxaralusujim.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///73799802661.pdfIn PDF document text
    • http://allycatering.com/userfiles/vanepedanateboninemama.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c513ef23c74---mavaminukuvulodukogoxore.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959a95c1307---gadavogepurevurizeg.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/55939188247.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd90445e61---13237127886.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/63966552339.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/58474321858.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b44783f95d1ed825a9da1a4782ec8f66/61828161096.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/rujuzokorewez.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/megixesoxoteperefixipug.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/15477840274.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 15584 bytes
SHA-256: 7234f688cbd9abaeeda246a23316b3a75f8b598c4c61c51b87ae0809d1f7ecc2
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 10668 bytes
SHA-256: 6dffd05f3a929e6f525bc6ee79a5142b29eba14e5dca34ffe5845788c5115724
font_03_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 17828 bytes
SHA-256: 68bb3817911fbb5967b8ba629b701df22358bef3596f8fc6a7e3a85f2ae9d2f5

Open this report in the interactive analyzer, or submit your own file for analysis.