Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb2b29472e39099…

MALICIOUS

PDF

76.9 KB Created: 2021-09-10 03:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51004e46837f8eb88da19011bf32281b SHA-1: ac6529cb18085b6a9b602bf66c77dfecae161d54 SHA-256: 3eb2b29472e39099dafae0f2ae39847355e3c51b2072b6a8762449abdda57973
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. These findings suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://newbiesites.com/userfiles/file/jexamenilodovinuxovan.pdf
    • http://gradn.ru/uploades/fckeditorfile/tijuwazagunubozujil.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4efd8288a94d6047cb760dc354654dbd/retureraxes.pdf
    • http://techbico.vn/uploads/image/files/gokoj.pdf
    • https://godahoian.com/app/webroot/upload/files/lapupig.pdf
    • http://snailgame.ru/upload/files/20210904140835.pdf
    • http://sportsgarten.com/editorData/file/kiteperekituviraloxetak.pdf
    • http://dr-onesrl.com/userfiles/files/97811296788.pdf
    • http://neodentpetrosino.it/userfiles/files/rugexavizin.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/77828645247.pdf
    • https://kaparatt.com/images/File/bavumovoki.pdf
    • http://remobudostol.pl/pliki/totijewodulozodeligeb.pdf
    • http://bjsddesign.com/filespath/files/20210901110725.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a298c4c777---83024006470.pdf
    • http://abwcockeysville.com/uploads/files/fawatake.pdf
    • http://ks4073.com/file_media/file_image/file/fejamaxumifonovelupijekak.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/956f1af505e5cebc967dfc6b78e56ae7/jutukejonimuxozoferalajin.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8039d7a0---22752665820.pdf
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/14390040284.pdf
    • http://goldenpeak.it/userfiles/files/22087095354.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/09ef7158b8789d3801c2395160eee3ad/jujujusoramumavaxa.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/83401473837.pdf
    • https://ecohort.biz/userfiles/files/wesawiz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=no+reply+mahalia+lyrics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c1.bin
287ed8fae6a4715dbf96c8304f96fe3ddf0c52dd494077dd77307e4101bf7d50
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 10528 bytes
font_01_sfnt_off0000ddb6.bin
d49bce55760600cd8114880a38aae91e99391ac5738904926e455ea7a833e6ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 18088 bytes
font_02_sfnt_off00010c70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 16792 bytes