Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eef3a08655d68c…

MALICIOUS

PDF

88.6 KB Created: 2021-07-15 14:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01d1cc4123cacdfc288bf156e80f7806 SHA-1: bdba807e3743343cf6ac18c6e16857fb1f432342 SHA-256: d1eef3a08655d68cb95ee7ff244642b68c128ecc6b6ab4f0538d384eb4d84e3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with numerous external URIs pointing to compromised or disposable hosting domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The primary function appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=how+to+reheat+boiled+eggs PDF link annotation
    • https://yz-yongzhong.com/upfiles/editor/files/jafiwunofixoremum.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/tusikulaso.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a850d906ffd---kemuxugajo.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d49e7cb1---49814236729.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/472d009c86903b3cfdfff9dbd11137af/manuvelevagijeratugososa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/637818ba96a7cc9c0f369fd82d9d17fe/3437498884.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/marudobonutepabiva.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/fafaxokaziwebapazopap.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ctvb26dqnch6f04hprssedqdb9/6640101582.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/99ab171d78f147fbfbf14445b8dce1f7/nubekikerozamijoxoxono.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/t0j0pob0m5nmn9st2u7bacc8oa/bunitemi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd238a2aff318485a3228e336fa2ca19/siravaz.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1e5485ec---jeraxubawevetugoramot.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ojpldmqtt83mphsdv8itibb5ls/27884648237.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/luvenefu.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/95292193916.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/oo94jfvv6kqd2c39cnq35f9d95/71726132211.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/vagaw.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/61634690320.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6bb44009f4df877435980a9cf04400ae/19836259276.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e57e9a2dbe3166b80f9cf7a452f120a4/75539901907.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc7a961763---7701122867.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b732a3c57---bawusazakagutaw.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/pekavag.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/zulepelumerijumegovukaj.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_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 10640 bytes
SHA-256: 38c4e9f540d006028826619025c741c1474505ed8f3d8dbfc83435941181c968
font_02_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 17364 bytes
SHA-256: 983eebe05ff333700d9b416e5520ead0b786aaf6b144fb1cb5797f051b7e5ef2