Malicious PDF — malware analysis report

Static analysis result for SHA-256 646ebaa149e988b0…

MALICIOUS

PDF

70.8 KB Created: 2021-08-29 02:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed5d0deab4f9010784f9d7b41bd3025f SHA-1: 8d34b68a66c7417ce8b2f71039f392dd18af03ce SHA-256: 646ebaa149e988b0883bd4e89c111fc12c81b69af912233b54421d23f1949373
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://bartuceviri.com/userfiles/file/97956118398.pdf In PDF document text
    • https://airflow-skateboards.com/upload/file/97563357292.pdfIn PDF document text
    • http://askort.pl/Upload/file/wetivoge.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/lefomad.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf81b321f9---11477865414.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8aa2482e66133ef3b6290d2de179ccc6/94556198845.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/28801382505.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/gapimavumuwozojowinefo.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/juratodoxugajuka.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/5301355975.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/90399402890.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d8ff0f0a5---vigakub.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/jitopesi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7uln49afknv2p13e5g7niv8bv5/xenesuweduw.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/82333695397.pdfIn PDF document text
    • https://blogsma.com/files/rotalegenajagulegalume.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/6020156749.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0c4635738---vuzemaxorotalonavibepo.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/e3e70887d0a4052dfb07d1b65e1fd09e/nirinepole.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/76380342931.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb7311f9d---fonokajuk.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/92dab97228c17a685a499025a46f3261/94674192339.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nevufaxixiretepinupep.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/97bc10582a931bf0b7ce52ebcc86d89f/rerafabazukonap.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/31273191124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ought+for+noughtPDF 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_off0000b3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A2 17276 bytes
SHA-256: ca0a212460531816e4dc4bceb6414dd1718ec9d711b992437da13abbc73824b1
font_01_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10016 bytes
SHA-256: 97543968404b426003f13389539bc76c2703949a26679ecfaf85cf7b3cc138bf

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