Malicious PDF — malware analysis report

Static analysis result for SHA-256 1489dab6adc33164…

MALICIOUS

PDF

77.7 KB Created: 2021-08-15 09:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53901b20d7c320bf059455e047f28a8b SHA-1: 07480b8471f5fdb54536d8437c6ef5840b2bbd5b SHA-256: 1489dab6adc331645b4ca023f311bee1d0d3f0383b5600e51038866e5d3e05d6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4355bb0a9d0b2bfb3e346e10d23789a3/1611506145.pdf In PDF document text
    • http://millecolori.it/images/file/gukilowufov.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/93417544383.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/10707333114.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d6a9cafecca9507bac3038e0a7a3b424/zegule.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/969de17vv47m9dbm5606ueb7m3/19793677498.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bopakorafasa.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/dozokenonov.pdfIn PDF document text
    • https://abeess.com/userfiles/file/susiragebe.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/kijezixuwimijomugijozemen.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/timef.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/dosipexibudafawu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/213mdgh58ct5r8tjoo1s0o43eq/53790514735.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qseeu20jr8km4ovs1a4jo08ggr/52353311257.pdfIn PDF document text
    • https://bselink.com/userfiles/file/46336950146.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lo7dedfrjtf0di7vvjqhj9q7db/vabulisiwazopipe.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/bizuwomixazebufozusemup.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dov7rpk9ncaiaae2cs382m8ijm/nabapanatasodawefejij.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10c2c4afee---96566301389.pdfIn PDF document text
    • https://bursac.net/userfiles/file/nezul.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/31d4d0d8afdedb614aa1915296ccf350/zatajedorowikatabexefode.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/pamusugavabafetal.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/budedilorokabuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bed+wars+minecraft+pePDF 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_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 10756 bytes
SHA-256: fba16f19f1b260978e7ef241c049e37dbf01ae5f2b7fdbb92b5753fdefc7a618
font_01_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 17428 bytes
SHA-256: e4f9b4e2a516a71b9af8e5bfdf0827a2820f0d72b60377e1012c4b3144bc302d
font_02_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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