Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a34f9c6146702f4…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 07:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d6433bcdc07dd1cf6b04d8fc0d19b80 SHA-1: d15bf06cdc99df98afed4aa6a9bdd5dc97f93a91 SHA-256: 1a34f9c6146702f4689aa4d793eb3431c7655fd08ef95bcae2ccb4891afb8a16
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to host and distribute malware or phishing content. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645e565cd6---reketubikukaneji.pdf In PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/57720749903.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/56708947879.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210904210147.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/11091520850.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/51441219568.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/sobojopufu.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/74658931965.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/60682839786.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/lidafijomejuj.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/89154806598.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/65516984130.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/26477451671.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/90738946317.pdfIn PDF document text
    • https://noventa.cz/media/files/file/79635085122.pdfIn PDF document text
    • http://mlight.cz/archiv/file/36446359352.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/lawugobubit.pdfIn PDF document text
    • https://tsolisp.com/files/file/ruxen.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16134efe787eee---78386400003.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/aa245da6816bd1602fa60a833386ed71/21232728110.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210904192210.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/riseluba.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1dfb26210---lomixoribezodonute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=game+horror+android+multiplayer+onlinePDF 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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 10740 bytes
SHA-256: 67be457dd3e5e952b8f117fec95cd42d43f38d100c2a2d2ec3b469f0b32b8d24
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 17408 bytes
SHA-256: ed67c7d536ffbbef732bf9e243bac4166fc929d2582b5fd37cad9c93a3cf2cc0

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