Malicious PDF — malware analysis report

Static analysis result for SHA-256 004a86933e64ca0b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-02 07:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 353654dc923e8e7c8a6dd0b108e6626d SHA-1: 35659520dbb747c7469ccbfc0ed54034f6e9a2a5 SHA-256: 004a86933e64ca0b39ac955c22a55297e9c16fa5867a8a909d2d7ef78025348c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual content, but the presence of multiple external links suggests a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f84542f9---74326190076.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ab8c3bcdda8edab9b74aeb6f3d16b617/xovikajaxoke.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108110604256273.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/bogeguvigi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb3a07d6f---parizekalowakinilevewate.pdfIn PDF document text
    • http://boldogelet.hu/media/wozebemunidiposeref.pdfIn PDF document text
    • https://sealskinz.ru/files/file/wutifuxuki.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/xapuletanozet.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5fc4b8bde21a11c878a92ed1e7aa51d2/xodise.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/40240983248.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/25547093695.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/c5g3o2pvf39lcds0hg8vscvjd0/18982853992.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/90239162669.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/nidasakadalejosavorife.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/resujojutanakuvanenip.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/i6gg2hd0pndf4emkstjqmfn4q5/kotutiwopugamisibewamus.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/77476531405.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/moludof.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/45556195521.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0v8h82p29s9p3sld53m0n5995j/68086119251.pdfIn PDF document text
    • http://www.asslar.de/downloads/47290499838.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/52281500394.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/wivodu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4fbbd94ab---lidizakijemifezisefuk.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/xitunisunimuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ckd+stages+gfrPDF 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_off0000bc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC98 16420 bytes
SHA-256: ee79955d715a08a3839b10990029a7084a7caa002a3b8cf6f5018eb77bb815c2
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 10292 bytes
SHA-256: 1bb0bddbb3eec969265706fe8994b17c653ad4caa7e25092654c007ab7b855d2
font_02_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1