Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb526440288c61d7…

MALICIOUS

PDF

90.3 KB Created: 2021-07-23 21:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fdf2015d1a263792058560caba33697c SHA-1: a0123d16ed43306a54e777b3b99ef57a940bb578 SHA-256: cb526440288c61d7d897ad0aff6b3142a395838e36c1b2612e3a3adc57999569
124 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a fake invoice lure, directing users to a compromised WordPress site. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves tricking the user into clicking a link that leads to a malicious PDF hosted on a compromised CMS.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://goodslib.com/userfiles/files/45145791294.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608865fbbc563---29714128108.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/46055872897.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/133b1fd3f121b0b065421cfeda59f6ac/jadatefojel.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/90113584205.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c912f554de---79171497593.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/votodojuxukoturixababuse.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/43426599723.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/a407paj6m9gpl5s295lrg63c7r/vesuxarokunujemixowotos.pdfIn PDF document text
    • http://imi.vc/upload/files/zagupiwajowobaxozukaku.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210722214301.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb792eb6ff---jajukusadubusitinulaju.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b8c02339f82fd3b0fc73bed5419878fa/62417281610.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c6435b1444b256395884fdc433db7e0a/26582383841.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be7ac328ee3---wogatijinikotumawukuka.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587e0c5910---totapafutovoraver.pdfPDF link annotation
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4dd2dca104e7fdae55bac771ad2962da/86582190547.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a637d900737---25655151498.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607506ae288e0---bipazugiz.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/33019100659.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b7c68fbe4bf4f8749bc5bbad5120190e/dexijevuxufesufowu.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/sunosagulovinem.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0eaeafebe---26366504930.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/97432116917.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c5f80d99b---zutunawawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+long+can+you+return+to+tj+maxxPDF 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_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 17288 bytes
SHA-256: a94d4d787dbf3363b3803fe5f4c36e14dbfed013ca934ab80b75f4825b649048
font_01_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 10836 bytes
SHA-256: 2550990fdfbcf18423160ac821599600de5ecaacfae135c37259dbfeff2ca6d6
font_02_sfnt_off000142e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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