Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca03b7d0e2ff326…

MALICIOUS

PDF

174.2 KB Created: 2021-06-28 04:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34b4e027f69c257b62623fb179daba2f SHA-1: 909030e5d34141a551a91728048835a5c21b7f2e SHA-256: 1ca03b7d0e2ff3267fac9e4c8cd656afbdf39f61f8ab2d3259998084e5829835
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c19008e46---viwixikubarigo.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc91753015---62492212961.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a54af07cea6---77897991338.pdf
    • http://freeski.hu/freeski/file/54799664675.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8d40314f---xanurowadigusogezuxobozi.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ba284b0c---zenozisazopuwubute.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/bd6ab7718d15ae03ee3d61bc2e68962a/tirixuwodojejidataboxitu.pdf
    • http://busanpc1.com/upload/fckeditor/file/duniwedifisubo.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3b04bb05---xubowalodenigupowuj.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31d35c0b3---kalibinezez.pdf
    • http://ctkupavna.ru/upload/file/60311392480.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9581a1ddda---juxenosunerevebube.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee7a3723b---parogezufiki.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f595cc790a---1191394472.pdf
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/87387586233.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf8fbdc987---69794660756.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/repomowemalebiguworid.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/3460169174.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6ebf4765ec812414bc145f0bea56d997/vopokebuwog.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8176dvrein0fkfevo80tsvefa7/zokonimowoserup.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806f610ca1a---tetonulesosopunep.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e9fdg5is692l3i0co9tkib1k01/29844895502.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/79d911369dddbf9bfae6e077f9d3b7f6/13781553875.pdf
    • http://bwc.lt/i/milevenagiduwuzexawi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rings+in+abstract+algebra+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022687.bin
e88a180b31dc309c64f3ee0182d5226afe5499b241a57963d16cb1c6a77729f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22687 16416 bytes
font_01_sfnt_off00023d1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23D1A 16792 bytes
font_02_sfnt_off00025531.bin
b7657d7b251de0090f7d4cc6d61ba6b8a7d3afa0921573d044f82d179c31e757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25531 10860 bytes
font_03_sfnt_off00026dfb.bin
6150b73beccfab6aef4a6232146a10f4f86de957a9bccba216b1c5b6a7d02f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26DFB 22972 bytes

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