Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c42e015f4fa796…

MALICIOUS

PDF

92.2 KB Created: 2021-08-16 20:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8bf64873ce5d70f61286dbc644e78bda SHA-1: 6a028f955093f2b007901eecf820264e93f728e1 SHA-256: b1c42e015f4fa796d15bb3c7d3dc83807767c4b823c06b13bccd55e48d24b6e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for phishing or distributing further malware. Heuristics indicate the PDF is a link farm on disposable hosting and points to compromised CMS upload storage. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://paradisoseminatrici.it/userfiles/files/naturona.pdf In PDF document text
    • http://myredm.ru/uploads/file/daliserik.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072807f0dd80---jumatuzatuvavunaliza.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/62336011210.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tapubesuw.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/mapakojosoriwer.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/63259495771.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210717120716.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/992e72e9a2b4abd509b3ca8afcf8e915/vogavoravezaxafusowifan.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/resifiwerowovijo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16080598654ed2---47560385607.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/tetarazasazur.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/11917823904.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7936ea6f---36217223009.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f59aa643---forobefososekadid.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99266dfd3962a02aedbd85b12ae431c2/40820445563.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/uab9l5qcd5bk1ku02vhs8eindc/tebekopelumiwiwinekonagu.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gizirafumowatigedukuketu.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/ditizofuwukapikedixufuma.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/90871640717.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/68563650a1c191318dfab12c5f9aafd2/zorixebonefugevivevavozaw.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/nidatudofeluvelob.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/015c4d1d764fdb015ade3287fd3fc76a/maxififixabimozin.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9ab9b3b0---mezepebabidebude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=crossover+psychometric+test+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00012bb6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BB6 18336 bytes
SHA-256: d55f96b1be5f994c505df6f399681bbfc1d6910f739e142c10d0ecab0b9dba1a
font_00_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 17712 bytes
SHA-256: 62a5844d8140076de2b23aa3d8fb7dc564d52b0f6f1aaa35092932fa5d62895a
font_03_sfnt_off0001488b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488B 10892 bytes
SHA-256: 1c130baa2b05b7a50bd361779f78ddbf487380b11a788cea52b9c74df0224567