Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5fcb0688490cad…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 05:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d71f0f7e706608caf857f4a890144b0 SHA-1: d7ef23a6ac9b1d198b2068cd249f67d1081cd5a3 SHA-256: af5fcb0688490cade82b16024da996795149609dc129e2fc902018b049dc532e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm pointing to compromised WordPress upload directories, likely intended to host malicious PDFs. The URLs suggest a phishing or malware distribution campaign.

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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c350ef39e16c1ec150ef7823e9ec834c/82710764759.pdf In PDF document text
    • https://cargobull.cz/res/file/53211430520.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210913_8C905FDBCA65D576.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/loritowovolusegemanavega.pdfIn PDF document text
    • http://3sdent.com/upload/files/gewiravukipekajutikakulev.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/mirumovegefadini.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/kifupis.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/25848305522.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/fuxutixu.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/36481567348.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/susopilususur.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/7928370319.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd8d3209f---wemujux.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/kokavufupimuwomovi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bd21f289409563d289075a9b36e86601/38503504156.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/gitozedodire.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/vazenoluraxuludabinira.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/98708369401.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/413298455.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/54b7425204a270b03b1afedb0d85cdcb/rosafevosodujeluzodiji.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0a339834---97251487288.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/34852682555.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/wafowobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ouija+origin+of+evil+online+freePDF 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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B3 18764 bytes
SHA-256: c05b804efa8cdbea8f279c9875bbdb059b623859ec9c5abc9f89d3b697165740
font_02_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10444 bytes
SHA-256: b7e8e99f9dbec56cd19fc3067ab6432161650002aa6603fd775cfe0186fefbcd