Malicious PDF — malware analysis report

Static analysis result for SHA-256 82317add14f0049c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 09:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1bf00f0661fe2a0f463c50fa1e2a906e SHA-1: d2a1d0927a77925d432963685e4062a332b240d3 SHA-256: 82317add14f0049c629ad64f3ab9d0e63937ecaededebe77612f797f57043387
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 websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=view+hidden+files+in+android PDF link annotation
    • http://avandcie-energy.com/ckfinder/userfiles/files/momavimadut.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/gevosumetesutaraxaw.pdfIn PDF document text
    • http://lamay.de/userfiles/file/jukubadawafi.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/firekatuvikikijoride.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/duxole.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/gimegulafotezulofakuxiz.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/gasadisolipabojigifunejud.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/70437672233.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96519626478.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/35968518497.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/26382266157.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210925174721_562328166.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/hpf3pbnv5dfp9mrj65n2id5foc/voranokebixerogaxewi.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/84945949685.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/43619434768.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069f202617---rikiwe.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149251a8ca8e---90272389807.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/97020157815.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/dd21c900a52b4e4e02906b31dd9a94da/susuwiluxesenopejemojiw.pdfIn PDF document text
    • http://cga82.com/admin/File/gajekufovasevikegaduk.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/zolozisotala.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091714273238.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e4fd01c5486f53536b77a17e616f797c/35603918593.pdfIn PDF document text
    • 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_off0000b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 10408 bytes
SHA-256: 891b252a5e857a2291bcb706ee3d889b32241ef04091378d48740327fa200ef0
font_01_sfnt_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 19996 bytes
SHA-256: 7cf866fb661da5af8a756d101c69e68b44a20a0daece9a87c06db8baab03706e
font_02_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1