Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a604e904380fb63…

MALICIOUS

PDF

91.8 KB Created: 2021-07-21 00:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0b658793ec7f7ba63614ad9c57362c9 SHA-1: 3efd4f845e719b83d94058da75ab9fa6b889fe44 SHA-256: 7a604e904380fb6317a754cc7e5d0a3c1da6dc0127ae086d59eaf46fd3319384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to WordPress sites utilizing the 'super-forms' plugin for file uploads, suggesting a link farm or distribution point for malicious content. The presence of these links indicates an attempt to redirect users to potentially compromised or malicious hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://okuninka-biale.pl/userfiles/file/sadewejokikinomul.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lugvghdr0ve2epct99g72c06v3/xotojawi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9oldq43ev6qjf783j69v02ttn2/72271754432.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/426gri19p00u5o1hgopgo545cp/rimematonufuze.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/7a6667f641cbfb514e4ebcb097c47a7d/50142181866.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/27b56c53071ca1e38d4b68c77e522091/gasevodizafew.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a16cc2b7c3318dec086d75ce60fb9db9/tesevovugexefimune.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/besoziwax.pdfIn PDF document text
    • http://3sdent.com/upload/files/51631410026.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d360c93---towivubetosivoxalosupeje.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7baf04b5---56549172233.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607949765cb49---68005507491.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/sizovekotolaxarif.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b34b6fe0d32---rijomolim.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/58946467423.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b42175a9---sividarurogudujowew.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/2306688736.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/xivafupi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/77ecaded8c548b5e0af93ad0c3ebab47/jozafufolem.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160893f1096af6---jadufijurogokeduzusafis.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/20043750343.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1d9279d9c9d5cc2bb5050b2d014b4e36/dikavi.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/85986988757.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0c057275---29821344617.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/12907ea01e76a6eb7d2424cc3dd8a0fe/mazuwalofonabupexora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=where+to+find+pdf+on+iphonePDF 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_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 17144 bytes
SHA-256: 120e5bbdf065449275dc7903abc15a62d13a35ead719194db5e3dbf1128803be
font_01_sfnt_off00013141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13141 10212 bytes
SHA-256: 94f8d6d89f9f509c7bdff33a943e2046e6e8e223711d335e77da93a1af060267
font_02_sfnt_off00014818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1