Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d436064b03fc11…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 06:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25a4149fccce824c19f43f18509c0031 SHA-1: 8a654f641cc720fff055f93cebb7b7ad87ff30e3 SHA-256: 01d436064b03fc1193a70a9a58babd494e61bf6b2550b05cdcd60b5bbda2faaa
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. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress upload directories or disposable hosting. The primary goal appears to be redirecting users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ad7106c86bf71b049782f0e2e845bc1d/55844141923.pdf In PDF document text
    • https://bnbcostaverde.it/userfiles/file/gawezisar.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21966a758a---jexojiwi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/nimaxarifasunebisubi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/veph8ovsbgjt2lasmhuh06u94a/jutafenodusugiraba.pdfIn PDF document text
    • http://topas.lt/userfiles/file/73324661927.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/75424705823.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/xiwifakelogasebela.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/nomipezujananewo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c148f91995a---xubetovaxefogejixor.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b428a8fa4---97825236091.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/52271524608.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/14662311155.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c46066aa8b4---daxonuvuvalakutafemes.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609102f56b948---getogejoxijokolagivenumes.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b331b9b56fe---73472758540.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094683a343d1---67528852164.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/fowemur.pdfIn PDF document text
    • http://rumputhijau.com/contents//files/wegeviruno.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/fudubutasuw.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484d4cdf58---5927600067.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/50260896620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=songs+with+apostrophe+figure+of+speechPDF 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_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 10976 bytes
SHA-256: 94d9314d4652199b53c921e9c4373bf341e7f4d893981b17cd1015071f6bff73
font_02_sfnt_off00012db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 18828 bytes
SHA-256: 99d5c6cb14e88efc42a2aa96374066f45f477ed93040798f814a9acf6c71611f

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