Malicious PDF — malware analysis report

Static analysis result for SHA-256 0245e4355a9d20de…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 01:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58234e42ddd72becc17d7f26686bcbc4 SHA-1: 37cab54cfd51b33a15ab251f429efd015c40fbe5 SHA-256: 0245e4355a9d20dec13e3fc1f1b1a93127f4811e30365f8625ebd8b8b67a40e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=how+to+use+omegle+video+chat+on+android PDF link annotation
    • http://pobierzplik.pl/uploads/files/vuwamojusamive.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/86068391921.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/43641204991.pdfIn PDF document text
    • https://iwistw.com/upload/files/38400445184.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/61970854026.pdfIn PDF document text
    • http://olympusflights.com/files/files/jupuxupetewovavidunekop.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/93069226286.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/kisovaj.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/giguwifije.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a0b1f65249285fc458d9510458330205/63860863748.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/luwuvavefuzoserifemozuj.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/xezosebuvijuvebo.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/42616407739.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0ca3bb80d---95468896914.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/86456659052.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/65093594408.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/kirabemogamezoge.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/35352882693.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/16398292599.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144151acb9e5---jewutatizutusewu.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/bemel.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/637cbebe900fc5df2e651d1318edbefb/78653692283.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/rerevebowudezivazafu.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jamofewelewetorirafumexa.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161382755880e4---kewenuvajaboregotanepo.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_off0000c243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC243 11060 bytes
SHA-256: a6eca45b0197aa4388e4d76f483b0a1818572e4050658e8144594445739beaf2
font_01_sfnt_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 16424 bytes
SHA-256: abff9d929860dd6fd61f92d7723d672aa39f77dbaca23fe06abd4cbd4d501e94
font_02_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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