Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a54227045079348…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 10:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75a7fd5d21ae9982fa93a1a64ac61c22 SHA-1: efc01404fe7d631f9b7020698bf92ab69ce6a4ff SHA-256: 7a542270450793488a9d45cc730c7d64e447ea1cfdc06c638c272af6f824204a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm pointing to various URLs, some hosted on compromised CMS uploads, suggests an attempt to trick users into downloading further malicious content. The ML classifier output of 0.9975 further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://marljivo.hr/userfiles/file/bafoxiseda.pdf In PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lorugofitizebaj.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d2305f97b37c355c95f52ff7e9c61a89/bomovatenegiv.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/65627485382.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/tujakozuvuxewobijabo.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/puvamozigidufo.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/25932266534.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/mamogowewelebinez.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/jerufave.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/dijudisovezurugarabi.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/lagopovagelizez.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6fa65adc4950d0843f518a645a92bee0/mejalegijorujilu.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/55314841267.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/65624997903.pdfIn PDF document text
    • http://alvitraders.com/files/38451217879.pdfIn PDF document text
    • http://recrute.fr/files/files/nanimoxorekule.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/44282574453.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/koxuvoborudovek.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/wikasizinasa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3cf9e9d15---1233052087.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210905_A7305031A48F2C30.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/lekukesem.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3391_20210913063352.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/duluvegalolalipazazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lumia+950+android+romPDF 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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10448 bytes
SHA-256: eda5483ff7edce376b9fbb0b7917a6313e91aa9166409214a7f312606c032528
font_02_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 17152 bytes
SHA-256: 4211354b9511bec4bf5baa089947fe07a6217fe09c6d0449a609c6714dab493e

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