Malicious PDF — malware analysis report

Static analysis result for SHA-256 01dcdc79ee50d088…

MALICIOUS

PDF

102.8 KB Created: 2021-07-24 04:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e51e5e7108377e66d35ba11a8e8140f5 SHA-1: 6a2d1bc6a537d7a6dda7341dae02abd111ca3bac SHA-256: 01dcdc79ee50d0885a7d655914d9050463b14d45906e1f9216ac2ad384288192
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the heuristic firings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 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.
  • 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.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f6178cad1---davatilidiketubezuz.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba37a2a2a1---366853456.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/24000536818.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/vitixisugolisog.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/widezakur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3ea93a9b---jotagibuzesanogimixenomo.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/28023508857.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087384e00c46---29118227082.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/vukupanarojusaxe.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f0c08cafe930dd3f57d1d60583e021a6/kolofoxejepijekati.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/xudekolipifotek.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/xufinoxawamebujijezol.pdfIn PDF document text
    • http://blueyee.com/upload/file/12122356794.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/jebivoxigovorojimujakar.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c7e42bf1a675a2008b7a5ddd6af2044/75735961734.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/maxobigamigixe.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46a02c9bf---lolodinumusozid.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1af9f5f766---77909158988.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/42903140794.pdfIn PDF document text
    • https://aitalk.vn/upload/files/sixavafuzomu.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/85481015217.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f0b6a85470a1e14a16016e8343b04845/rerivetepuno.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/xetumer.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8433894425f07d03b7298df3764b1e93/20028549821.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/4ff92a933c1d82fe58801b35f0f781a4/ximekuvabesowivo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f66211b09e---44096132480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+dangerous+fellows+safePDF 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_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16828 bytes
SHA-256: 0a64cff5b841db8cad0b4a328262bb426fd1b6b2b708f4c546be20404dfa8911
font_01_sfnt_off00015cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB1 10476 bytes
SHA-256: 766623de247b65d397331b5ed4aa8e6790600ccba6419a5553c2c2dcb5071e45
font_02_sfnt_off00017473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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