Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef5f6abdaa43dea…

MALICIOUS

PDF

91.3 KB Created: 2021-09-07 06:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64f52342ec4730ad8667e3fef12e71b1 SHA-1: 498e35f7d151331b0e4a51c3a1ee557692c29702 SHA-256: 5ef5f6abdaa43dea14b3bbc58e635aa628fba9b305080e82d5fdbafca18a53dc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd894d2e06a---mapepesinadegodo.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1716cf8c695be0da02264cd191b5f51b/gajegobivurolanujomiv.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/79896409595.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/memakuladelakidoviji.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/47626470522.pdfIn PDF document text
    • http://nessium.net/userfiles/file/balol.pdfIn PDF document text
    • http://dalaichau.com/files/23061928845.pdfIn PDF document text
    • http://nikoljski.com/ckfinder/userfiles/files/27188750623.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b37c15ab0---75018674110.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/64654371067.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d45298ca---tafaxesinevoxexilag.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/52930535680.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/daruwesazurumitu.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/76787268000.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/kuwevodisobizanar.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608090fc59ff1---wiriwexizakujere.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/vijerogenigukosovefurijum.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d5a2a7d2e21dd0580faab85c12675bee/wulumogijomaxedumasuji.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/92563903352.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16117854679d9e---22692596080.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/21731783256.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/88956350f469ce3ed0707f6efc502227/xazaji.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4b926411ed1be72ff8f1d0841f0a1306/zuzefakejeror.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vpcs2onv8sbap3ocsho12klb33/8160561822.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/29174168c8315a7f48e941ac17f9dde4/mezaxagikorexepawazadise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mitsubishi+galant+2008+manualPDF 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_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 18576 bytes
SHA-256: 71593eea51ce1b7e44a18b4cf232b5e6e43b9a3dcbd069dc732978e930b5e063
font_02_sfnt_off0001468f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468F 10884 bytes
SHA-256: a9474cc3b502386c75f34ea4ad8450d56596136ad4ff09be82e0db56f9a72890