Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd49e138b8c7cd5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 19:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a3571c3d24170a92232571c60021948 SHA-1: af55135aff4486cf5d8ac7b7175d75300bde6bd4 SHA-256: acd49e138b8c7cd50ed2b44f5d38668dbff9f0cd2aeeace94407ce93b227e88a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pachetedeturism.ro/images/files/40328220414.pdf In PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/nuzogasugepewozodit.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/godogoxivag.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fumajajapen.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xizativabowatenibenabufi.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/xurip.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/40533642177.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/13412843007.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/31941227490.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/12398046401.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/95134621111.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/zizadajimoxinesaxa.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/63707376198.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mqu8h7nknil731ta4vig7mjut5/xufesenozivokoten.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/95992954482.pdfIn PDF document text
    • http://ecole.ru/text/images/file/41878465185.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/8772255574.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139adc9a7901---litolirevepagi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161480d5323e6a---78615679444.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/3868157394.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/bazugedafejideruginuzap.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/numuti.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/lapavotifanune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sweet+robux+promo+codesPDF 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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 10776 bytes
SHA-256: 55bdffe3f1053fd5965aa35d4dd50d7eb6c848dc827c3d4f4d86bd090db593f4
font_02_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 15784 bytes
SHA-256: b646aff77799965f474cd2c79d191c22b4c7e4e8aba0b208067b1d45a580b453