Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f651d6d9c222b4…

MALICIOUS

PDF

106.7 KB Created: 2021-09-11 04:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 32c14bb966862552ab956868b2b78a1f SHA-1: 97057d30e753f6db43ce8c4f2fcb2f3af5087b2f SHA-256: c2f651d6d9c222b4678303b27ab649c7139cb250f393db3993f370e569ddbbff
156 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. The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and the nature of the links strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131818a913d5---togotebafigitofonesisivo.pdf In PDF document text
    • https://nucamsa.es/userfiles/files/37180182479.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19c0e94e6---xevilajijasufo.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kojawedojib.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161327d9eca7ab---pexerejigugo.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/94201441311.pdfIn PDF document text
    • http://retailcop.ca/files/matewinizujuwinorotif.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881a2df862---funomakefagijol.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/wiful.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/96924776960.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/37338024852.pdfIn PDF document text
    • http://chapelguild.com/images/usr/19506734481.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/dusabegilonafiwabel.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/3595775823.pdfIn PDF document text
    • http://full814.com/upload/files/xalevib.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/39267169642.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_F0D8109E07AE5F4A.pdfIn PDF document text
    • http://charontrade.hu/data/file/60261973766.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2109e94da27e49d49debf4c84739027a/17030524385.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/31415540137.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vizoguda.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2d3143fd---83915574752.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/damepumafufugasab.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613803c82c8e4---bukokugafifogisonefix.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/45580258752.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/43c7b78c3429f1680f63e987fbf1689d/65770879891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=google+pac+man+doodlePDF 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_off00013b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B28 10436 bytes
SHA-256: 902ec605da714871e36d9a60a2d80fad43f518c22c24d6ade82b29f4d58e92ff
font_01_sfnt_off0001529b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529B 19260 bytes
SHA-256: 2d0089cf2dc2043db5e5fca7f818ef0d46372959299ff5c6256aee24b383e337
font_02_sfnt_off00018465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1