Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd1e368e831cf8e…

MALICIOUS

PDF

86.5 KB Created: 2021-10-10 07:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: acf3b838ecc213ed09c19a891f026bda SHA-1: 5a676e97968fe7ab9fab539c5bfb13813201587a SHA-256: bfd1e368e831cf8efc4e1eae3ca8cc644450adca8edd1969d787f846378230a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, which is a common tactic for phishing or distributing further malware. The presence of a 'download button' heuristic further supports this, suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161624a043d026---51265354006.pdf In PDF document text
    • https://presstone.hu/userfiles/file/lefufolep.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137001cadb2e---47453859652.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099160120d---sapilosudejiwuge.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/fomefa.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904055721305619.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/49396610727.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/ririjuwafalavadavi.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/kuwigobatunaz.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/susikil.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/79979425192.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/lisepegetekumat.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210907094728.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ced3fdaed89525630b4db376aeeed0ed/xaxugitewibebifi.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/xurexajiretefima.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d11575df03---fizenarovitikowiboxuxugix.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161604e8ee5078---ravudixukowesuva.pdfIn PDF document text
    • http://unite-chem.com/upload/files/zinapijoxulu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/fugekuw.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/gelejaponesorixenalina.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/5518775643.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/vugimufuzonevavevojev.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/15857417124.pdfIn PDF document text
    • http://hkacca.com/userfiles/40763248306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=modeling+and+simulation+books+pdfPDF 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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 19392 bytes
SHA-256: 8adfe4629bcffc3e7cfdebbbd3d399d8874c60c9f27e1ef2a50fda810db7a9d5
font_01_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 11064 bytes
SHA-256: 55f18b682757155f0a1b40872b0593d5c3578957e3b24abc4797e1d371670661
font_02_sfnt_off00013429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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