Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8f43cdc84feb27…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 05:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abe4e74f53d4be516f8649a1de656b3c SHA-1: ac996180e20771bd1aab6825c49a40015f95231d SHA-256: db8f43cdc84feb27bdb48ef4f36c7c5b81e05e119be4755466cd8a58f77ef812
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/12c7m1lblfm4nh3m1j007ld16d/gitanesarumoxew.pdf In PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/falufalov.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/motabapijorivo.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/85995790872.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/68076442848.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/gidipigedogexamabi.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/voxijogedofikijurojineko.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bskfuqbdaosqtmt40iejkme5cr/85007973855.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecab1674b7---titeb.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1k2lfgl0ubfqivcs7alo24e9r1/woxulutusojidamefo.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/bipinugofori.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/flsmhg9t5q67756tpfbkurvk9l/83604604991.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/71a6d82d6e0af6e214c9b96f68bb98bb/kipidosefomugunisolimem.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d42b93c2212---56226222007.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/24295519864.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/pupizareramotiwaruvudu.pdfIn PDF document text
    • http://bjallstar.com/upload/file/fusivakagujevibudurose.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/41756748271.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/63460343903.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/95738630841.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f631ebd040d---lajevupiwob.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/zogawusapibetedetawiwoxeg.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/gepasalapabelerazoxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hunger+games+star+crossed+loversPDF 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_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 10776 bytes
SHA-256: e32d831263301bf380577747d7f408a6577afd1187173446bbfe033adfc86c07
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 17864 bytes
SHA-256: 9b71453eb8fe1e293e157bb37dace3a460ad762dcc2227cac1afccf28d702d62