Malicious PDF — malware analysis report

Static analysis result for SHA-256 712a7b5ad51cccdf…

MALICIOUS

PDF

82.0 KB Created: 2021-10-09 11:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c2d3733e89dde5e63f3dd88c600882fb SHA-1: 4baa9e8439dbd8e68e76c2236305fa61be0001c5 SHA-256: 712a7b5ad51cccdfde9f3e68365cddfb5c826aea3770232bc4dd070e5b25e96f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1a6fc3dcabe00f2359b2be4a384130bd/dabenesajimuveni.pdf In PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/zunipifimuxawotopuwe.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/45855905336.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/robapepasuxitexafi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/vipezewuzodovebu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e272c4d8c9---48105442264.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/vufan.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/disitusejavuv.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/koxeme.pdfIn PDF document text
    • http://dr-temt.ru/images/file/47991340120.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/nilipuruganivukuvowoduti.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/33112227325.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mogubazadobakatiruwekug.pdfIn PDF document text
    • http://maksimetall.ru/files/88475522393.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rgp1lh97jhb714h17a0qed2l9r/lekigimisijasis.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/61131655150.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad2456d3a6---11774764900.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16134a65a216f5---javixivekunojin.pdfIn PDF document text
    • http://tahokart.ru/userfiles/file/zutezote.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/nupuzesopubelikejuxi.pdfIn PDF document text
    • http://lecostationery.com/files/file/21795737598.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130b16876036---98323638936.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/56080920392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chewy+chocolate+crinkle+cookiesPDF 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_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 19520 bytes
SHA-256: 2dff83915fa01531b58f928674166120169d761347b9244401d6a87c4567f441
font_02_sfnt_off0001224d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224D 10648 bytes
SHA-256: d5220abf6d050d35fc0343b286cb7c415bc5c5c3aa48977de8e1b2147915a90b

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