Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ebc88f95ea0629…

MALICIOUS

PDF

74.1 KB Created: 2021-07-30 14:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7800d2f7e3a946c4138175ac016512c SHA-1: 7f863b3f7daf4a5cef0109506b14717d44be5c6f SHA-256: 42ebc88f95ea0629cd58d5ef99a0d1327870dcc47c81b10513529232db40dcd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=the+norton+introduction+to+literature+13th+edition+pdf PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1d1ef084829018c6e69d673cf31b68b5/lobodugexowepusetukanexo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10d7e8cc52---redepizakuwo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb2e9ac06---kawofaxumararelakizafe.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/tokikusibukelotajuluwadar.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d0fac8f9aca9d8a0869d098f052085ca/64558951455.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/kobemuxunekotigesodewufa.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982aa8df5a5---zikinuberikavepedoxuzugus.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e968828998---zoletowugosodefen.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/30eefcfa27cdc5e4c560fcb2fa5364c0/82977008877.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890b6f5d7dd---tomujijosilenetosefinava.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967a9e44e3d---vajab.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210730130541.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/74388442385.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb8be8fc69---6324869347.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/90028ce05c6034e0a84498a70d0df51a/supuneziduxuvatotebamezuj.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/24452908361.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/mifegitagemefugorileniduk.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f36bbb7cd51---13537717498.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a76da448---jafume.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be4a3563a---julebavakeropijonode.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/dusetukevo.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/gitupibifelerasureloxodo.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/89159389149.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1b6310677a63f0cf2aa11415c7644540/47941206908.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/50203442810.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_off0000c00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 10836 bytes
SHA-256: d41bfbcfd13f0c07d3abba4ab2be1bc40d822fd66f3da9c7ef0fea97b0541a49
font_02_sfnt_off0000f11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 15588 bytes
SHA-256: 4779591719093d08e1a8afaa615debc5b2e50c447e120f5646a73627172255a1

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