Malicious PDF — malware analysis report

Static analysis result for SHA-256 727114153ab7c54d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 21:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9eb64b1a84b3498abbf4abea35ad8c4c SHA-1: 3ba7daefe142d4307b6037ea6fbc519e49bd1abc SHA-256: 727114153ab7c54d17523e943b6d2ed07b1ea89ec94d85b007b9970aedaa9209
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lineshare.net/upload/files/20210912195553.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b07f2846c---joxojesurupukupifox.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/82529227279.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210910_151949.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/paraxezosewaveferad.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/pibiba.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/6617789427.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/rajad.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/92718243723.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/fimobabikorosabowogigar.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nibisawoxikizof.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e4621949---jumobuzote.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/warasedoforunefuwig.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/22629974903.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/266374776425e274c389cd26cf3f327f/wipezejunonagifujisinof.pdfIn PDF document text
    • https://hoavily.com/uploads/files/fepopoxewadekofi.pdfIn PDF document text
    • http://groupkaishan.com/d/files/21167694734.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/fekobozi.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/zeruba.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd03803494---gowakodesisuputovuzifanoj.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/57837988034.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kovomasubogapelara.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/35628712040.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/58718978145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+iv+android+2021PDF 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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 16956 bytes
SHA-256: 20ef597a6a1b0fb36f3021bde2beb391163b5913062ab3154d2bb8150c524859
font_01_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 10296 bytes
SHA-256: 5078ec8a4eff272fdfe54f9fe4088375af2c155b81e85cd1305693169f43ccbd
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.