Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a69250537a22e4…

MALICIOUS

PDF

85.4 KB Created: 2021-06-25 22:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11ddeca4de5e2c335835c301c97b7f9a SHA-1: 2b21add61ff445f26ea466d8942b0b15b11656ee SHA-256: 90a69250537a22e4882e957ca0d04748aecf5401b414c28073de00d7867bb148
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/padozilisazepilirigizi.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5dd015d79c2f80f5387e5ff9ba25f4ae/75611822396.pdf
    • https://qnzar.com/files/5856104966.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d371e4a98f2fa30a754d90000d9093d0/nosalofudabuv.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021662144305546.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9f5fa96e812c314f801fe9e6369c728b/devufogaripuminozejava.pdf
    • http://clinicaveterinariacene.com/userfiles/files/xokevegemad.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b4360a2edd17b938341a8a0cbfa31da4/77996848447.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/63f5a520a2a9b7e3adee18c4c94885b1/39352819811.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875ad382027---fijirowuzem.pdf
    • http://mini-garden.ru/userfiles/file/16255252460.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ecc6ea13---xogudezejoduxewunedeniz.pdf
    • http://kccmaul.com/files/files/jitefe.pdf
    • http://pogservice.ru/userfiles/file/biseladopolomabobunedosed.pdf
    • http://stroisvias.ru/userfiles/file/82269121591.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070008357d8d---zejeponolemalugebavo.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0df8c91230---xonedufuditilonilo.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072807ad53f7---62121537961.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/90f598e7a8773f003fd582741fc5f295/88541156147.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf2de344c---83847938103.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1da889b336b0520ec97d43656a2cb1a/73731442074.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d369df11---muzatagoxobu.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4268d3fb40---fixusofinibavap.pdf
    • http://bukhatirhomes.com/userfiles/file/61770197411.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5344dfdff5b065e8c5d59ab2d3638784/23322668124.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cell+phone+triangulation+worksheet+answer+key
    • 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_off0000e902.bin
db2e6a8414a6ede9df3f59df59935d5b334c644477638ba32fd0230001c0848b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 17356 bytes
font_01_sfnt_off0001169a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 16792 bytes
font_02_sfnt_off00012eb1.bin
9b71baa43bbeb9dbe2472c9cd2badc128054105c08aef119fc08c19a00745406
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB1 10952 bytes