Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e836d4f3e566572…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 14:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 991a98d4b4a7d2bb9c4264df22a59592 SHA-1: 54a2f632d1613d1bd5a2da8278c0582eddf840f8 SHA-256: 3e836d4f3e5665724cfeeb59e274929a25dd0d6dc05c2a3a03856b42b3a1d875
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The link farm points to compromised WordPress upload directories, suggesting a distribution method for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to further malicious sites or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=my+hero+academia+season+5+trailer+english+dub PDF link annotation
    • http://sola-brothers.com/userfiles/file/wadogizilu.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/ruziri.pdfIn PDF document text
    • http://ranch.pl/files/file/bitefupoburogepapu.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/79257610981.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e610271041---kazos.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/16663018349.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/39789271322.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/vojotetuvopuxifotuneseto.pdfIn PDF document text
    • http://soupworld.de/upload/file/17193469005.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/pimudabiwumuguxejekix.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/16337806071.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210905051629.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413046eccea---jiduvedenudodebife.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130074412498---61535988563.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/2152430731.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/metedirim.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/33476164851.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/7079872316136e94958615.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/82189942307.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/86773672479.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/sifiditarujafasisakitag.pdfIn PDF document text
    • https://tebra.si/userfiles/file/najimipovufomeporakufulaz.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/bevevemibemawipakuzatunab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC6 11296 bytes
SHA-256: 1732126b909ee9747483afebd045e27e8036484dcf9c809ec6fa5910c3742845
font_01_sfnt_off0000c7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FE 14400 bytes
SHA-256: b581dd80c99649a03cdd4b0e7442ba17dd53bb626f31e4ed890affcc8dbd4bfd
font_02_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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