Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a9efbb860a32e4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 12:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6591c0695fb2e83c76a40ce428971be SHA-1: abca4f189642ddd0897741b93164839a2c6194c8 SHA-256: 37a9efbb860a32e437885f01a3cc5a3894ddbad63fe3eff4842cc48e5477be01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised CMS upload storage, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aradovan.com/userfiles/file/33260877097.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa8aec237---93468522740.pdfIn PDF document text
    • http://jarosi.hu/files/file/niwujedudojutetetebi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/eba0e7fb8b0b7dcc3e214d77eb36a59c/28488882051.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dazefilazafumonaxigazon.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/15606963462.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/97021073721.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/36386547805.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/9148576303.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/28033f2cd4538ddd2fb81fb0604df34f/misixapovuxatibadal.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/porutoru.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4ce0fd92---jopukufuwajoduretagi.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/47525831780.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/walok.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/b74k4sbdvcvmb5mv5e8vcub0mp/80742736032.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210828_141816.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-23/20210623025836794864.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/2998187944.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0731c364---59037571510.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/35334841538.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/48703030986.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/427744397.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1629514011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=12+divided+by+3+by+4PDF 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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 10088 bytes
SHA-256: f7fe130515af4c1e11c84ca223a437c93bae31b0b0a2a47e4a5d4e48adab8574
font_01_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 17836 bytes
SHA-256: 9640f3bb37ae048925763f7ed1f8b9351f127f7c17f1cc73f0fe5c2dab1950c2
font_02_sfnt_off0001212f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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