Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeeb139a9d42ebbe…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 02:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0d46c1672840b60f28fbc80ec2088ea SHA-1: 9a48a40a091469584981b44e8436cb3c9fc4d44a SHA-256: aeeb139a9d42ebbe87e2069ed4383f8e60adc01139307c1d9d6c0755c959bee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d357d3b3a---69334587065.pdf In PDF document text
    • https://baoholaodong24.com/userfiles/file/31159137905.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/gapaxunakamaluxuv.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/381506020.pdfIn PDF document text
    • http://aweibel.com/Photo/file/maguwufopasepubanugeroba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074adc91ff43---jarutasod.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/22065c45e8205f6fdfe107fde1bdb35c/tofozozenefopi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/verisajunoga.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/84e5822583a201f3f8ea3e42c7dc6420/29302502236.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/bixawovafuze.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/41448054058.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cda081058---joritasujitivarifinuvax.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161110fe304b7e---gejuguti.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1a32af9237469ee37b4425ea7891ad79/wojemamatijela.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/794013f37a7656769469bfe5cc02a94b/nugajojotepuxojedonotege.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/42794415185.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/23852934189.pdfIn PDF document text
    • https://shibbirs.com/media/files/23587744019.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/wuseduxamexadexetotixu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efefcae5e49---61442521853.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/pujof.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae909c2548f---nexiguwakemize.pdfIn PDF document text
    • http://progetec.org/userfiles/files/sedulitemugadumupava.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/63712382560.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/92212242539.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982f2882679---ribusuzojesujisip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=low+tyramine+diet+pdfPDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 10604 bytes
SHA-256: e0762ab3ab6dd400656c4bab27b506871dbca104247ae56f719a739afac9b14e
font_02_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 17532 bytes
SHA-256: 2fc832cd6e10053203a9170d2fc3b967484c23a1a8013390fb63abb642354658

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