Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc69aeb31c7e454…

MALICIOUS

PDF

90.9 KB Created: 2021-07-01 16:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6b84ffa8f617ec55cd95acb9c662c94 SHA-1: f2f871c9a310fefb07c5f71336433a40b75655e8 SHA-256: dbc69aeb31c7e4545a46cdeebaba1b245aecc3c3550ccb1f0a3dec5d2e9c2cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d7990609214f88ab6ef969e948a5c7a6/fobub.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cpcf0uv1rpv508sv1c7r2231t7/sifureruxumaweledilax.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f2e489f3b1a23a825e26e23aba3a98dd/77899017417.pdf
    • https://steklo-shik.ru/userfiles/file/85372276549.pdf
    • http://hyosangjo.com/userfiles/file/20210619072809.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847744851e0---seratefuzikivemul.pdf
    • http://talleresjpg.es/img/file/94228720690.pdf
    • http://www.pranabkumar.com/fckimages/file/98491619104.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/db761c0617546c061363023e27204ce6/lebijijasobe.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bf388a5ea---suvuwerov.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3888ecbd---jamorowesogif.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d16b7b4292ba9e49fcb6214a7f9e6852/xilikobojip.pdf
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/36896651503.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08774c6e5---81956340963.pdf
    • http://baobiachau.com/luutru/files/7490985392.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750e7a926c4---28887197672.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/71529718059.pdf
    • http://aaaexpressheating.com/userfiles/file/mewifudo.pdf
    • http://thepnguyentran.vn/media/ftp/file/64331396299.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879541aa213---38286287435.pdf
    • http://dobrasekacka.cz/userfiles/file/ledoto.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6c0a57a4---39111324560.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exponential+function+practice+problems+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba1.bin
600d724fa5af6526768c8fc70a144a7e843d28ebda5a58f68c77b55a121382ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 18348 bytes
font_01_sfnt_off00012c78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 16792 bytes
font_02_sfnt_off0001448f.bin
0fc84fff23d507435f95e3f42b398da8391594208a802e969281145695175f71
pdf-font-stream PDF embedded font (sfnt) at offset 0x1448F 11156 bytes