Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b162ad70868115a…

MALICIOUS

PDF

82.9 KB Created: 2021-06-07 06:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b45f17e69b06eddf08ab44d16dcb1b SHA-1: 730420d5229afd0a3cb5846be2b3bf08e61be6d0 SHA-256: 0b162ad70868115ace8a6465184bd59bdda0964cba5fb382e134ddc0c62db2fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains keywords related to educational topics, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/uplcv?utm_term=english+project+topics+for+class+12+cbse
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b18932b9c65aa231639178b08e78e905/65516503570.pdf
    • https://zold-kommando.hu/files/woloniwevaregizexi.pdf
    • http://www.cerathai.com/image/upload/File/89870672367.pdf
    • http://ghalemdi.com/userfiles/file/14779696779.pdf
    • https://ludifrance.fr/userfiles/file/negemukezezoxonixipam.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5fd575a0cd3439120c1219d9e1037be5/62724123586.pdf
    • http://kovacsoltvaskerites.hu/images/file/lufuvudejusatonutidu.pdf
    • http://belgium-ex.com/images/blog//file/94714875749.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c6eab93be3875e81550fcb3a9d30bcd8/safipanilenukitis.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/da11d7632eb0a2d506fe1465ed6291b0/97402303325.pdf
    • http://unesco-mediain.cz/fckfiles/file/9608507835.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c258fc4625---36463736134.pdf
    • https://alice-immo.com/userfiles/file/28451642890.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd584e0acdf---jakozedoko.pdf
    • http://apsara.ru/userfiles/file/vazenerobogoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e317.bin
54bc1efd7956c8f4cf25de8dd93b7f267c1a799db804e8565fe075fb9e7565e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 5420 bytes
font_01_sfnt_off0000f57e.bin
64e4ffe30b803baf49efc9985388f1235ea30bd6eeb05db4edb3e9b33f21c50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 10828 bytes
font_02_sfnt_off00011abe.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 16204 bytes
font_03_sfnt_off00012fee.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEE 4324 bytes

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