Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8f2c8b4853eb0b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 20:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2423d3f8541aab220e071f47ec61ed74 SHA-1: a661b4e7a52490c98d2a289646a6b10473ee6ba4 SHA-256: 7a8f2c8b4853eb0baa56a78b064f39b73d69288cabc27f0ba95dea6feb8e4b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and other PDF files. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cukiernia.eu/upload/files/zabilagefetig.pdf In PDF document text
    • https://biothiennam.com/media/ftp/file/raderowisetazomirusikifit.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ef0e9d272261c5db40aeee41a0143020/31923608013.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b89118b5f9c---4861128736.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/54174534034.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210720_4b229.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31ea10dbf---zorokis.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb26dfa1e---96251926091.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606f194aacc12---2726864546.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/24753610595.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa67d04291---36330700208.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/bowimebawemato.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5e68de652---davejalesupanavasopikub.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0e6876824d8f55902ef52b69ba1cf995/pazitesoto.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb7992c7b---47713760768.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a30d54f6a---sokaz.pdfIn PDF document text
    • https://bfull.ru/uploads/files/40693064883.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/gezupavaboluvifud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+%D8%A7%D9%84%D8%AA%D9%86%D9%85%D9%8A%D8%A9+%D8%A7%D9%84%D8%A8%D8%B4%D8%B1%D9%8A%D8%A9+%D9%88%D8%AA%D8%B7%D9%88%D9%8A%D8%B1+%D8%A7%D9%84%D8%B0%D8%A7%D8%AA+pdf+%D9%85%D8%AC%D8%A7%D9%86%D8%A7PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ed7d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED7D 23320 bytes
SHA-256: 31975cea88bd677bd2833d76a4aac214bc239ae8173dcf1da0263e9f95eb8ffe
font_00_sfnt_off0000b923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 19700 bytes
SHA-256: ac040a896d2bf8c9273d07d9dddfcb910a3bdb948ebf330d5194e78aaa362c4f
font_03_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 20756 bytes
SHA-256: 0a7caa6cd74eab0f99009ec353682752f9867026942a39f970c0d5e1596dec0f

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