Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5211cddac2bc76c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 22:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45c7a7170f6ff31a0b65abf0403567d7 SHA-1: 38a768faa54ba2c6c5bf8e71dbd722db5e56d58a SHA-256: a5211cddac2bc76c83228bd9d487fc57ff6139622157768bcd498eb337b4da6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ketchas.ru/uplcv?utm_term=basset+hound+group PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b835a23185---33865201165.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10487030645.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/73880056855.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/nazumero.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/80520155044.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/30237012505.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/xejapitujixul.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vajadufadigejunexi.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/kabowakotebegin.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/vomevamodegarur.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/18083585869.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/legusovirosusudi.pdfIn PDF document text
    • http://soupworld.de/upload/file/47609868460.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fokogisuriralexopun.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613956c2861f2---2087047400.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/4425712083.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/74603971889.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613c205a9a65a---fukutilasurekuf.pdfIn PDF document text
    • http://kftchem.com/upload/files/73164851999.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/32904671577.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/xoxofelive.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bab861422---soxagitopura.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec27b2b0cd---gunixuwiwekironututojizuz.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_off0000cf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 10684 bytes
SHA-256: 197b882af33a5aaeac96f51531c7d22677eb0e3498f7b8c39332df10c24c115f
font_01_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 18264 bytes
SHA-256: 5dd41fd50a15ac1949023369867bb2b5982aafb678cb210928545395fb30adb1
font_02_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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