Malicious PDF — malware analysis report

Static analysis result for SHA-256 838c2f104116d8f7…

MALICIOUS

PDF

99.6 KB Created: 2021-07-04 07:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d3925d117b927615bb701accaba077fb SHA-1: 5437fe4964a1e83866d6c31a8d4da4c7e9cccaca SHA-256: 838c2f104116d8f7ab97424b0d8a7c13b2ccae3959148dd2ffb733505ae33fa3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9678

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 https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/od3t152j08i9o5rvkpmq52poti/69411181162.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1c8716ff0a3cd56ddec94e92bc3a304e/96719115607.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/gilozalib.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/gasuxomonogovavolunemev.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/88bc913226a71e1de466415aab93f287/bemuxaxibogebimizafegom.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e0935d8ac76---44282477555.pdfIn PDF document text
    • http://ibb-online.ru/f/file/3113312069.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b9dbe527a640b302dcee1316a71cebdd/9174046017.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/popigiboseviwonibiporug.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bbf8bf4b0---20995119229.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/def9b7e4ba852ed9fe5557eb203919eb/27489347041.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/76772491372.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708570af631---78968743926.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/nuvufisimupumugagowaz.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/89416491801.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/86a62b521c30354720cd2fc0676d33ec/33246741601.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/75274387584.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jseruvf33ng2idfp49duebsnt7/37233058401.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7559e92342---muruwemuvepavotu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ea223365---71824851571.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/relasam.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab06db31eae---livat.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8751d8b28---39298484443.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/58079719253.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1895aefc247c2b8a4e7dde74e38ddb0a/nezogezapipimej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=miso+soup+ingredientsPDF 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
font_00_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 10452 bytes
SHA-256: d08d6bb2d1ec7ea3e88f17ffd595e40a27d20aed54b02bedebce024e83a396bb
font_01_sfnt_off00012d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001459b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459B 2904 bytes
SHA-256: abba802e21682f91d59a80a68f5abf185b9bcff8d6eff476b56ab1d3f2fefcfb
font_03_sfnt_off0001519b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519B 18032 bytes
SHA-256: e736c1c7ba97411aa6a2464ac3411d8673b574b885abd14a9a91a8c2fb1620f5

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