Malicious PDF — malware analysis report

Static analysis result for SHA-256 c442e856b467118f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 14:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b7130f00b5244bb469917cdc107a9af SHA-1: 143a020bbaee24546676deba40ce5c4fb055001e SHA-256: c442e856b467118f754f849eee2dcafb6e9cf2259b3e86ac2b540c0a046ceb44
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and file download locations. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://wenxuezj.com/images/File/suzawaj.pdf
    • http://imoroz.by/upload/file/36262671654.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b8130aa0aa7531a255ecc984a318ec25/63239073589.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/80aa06b8390f04690b7a002ae390ea0c/85862213817.pdf
    • http://angelcabrera.com/FCKfiles/file/fofojewovulokalalibixa.pdf
    • http://tunglamgarden.com/images/fck/file/79662212439.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/zamiwujedizalijawapaweki.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615335fde14a3---55335446336.pdf
    • http://nincity.de/inline/file/82644955623.pdf
    • http://uhorder.com/upload/files/86367676012.pdf
    • http://nikolalepojevic5.com/multimedia/file/77965957718.pdf
    • https://luiginoiobbi.com/userfiles/file/36517267075.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/supon.pdf
    • http://hpworld.hu/data/pic/Image/file/mokuxad.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/kiluzisufiwotuwazasuviwo.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9a09fd915a56c14442e9e64d9986e21b/4632984055.pdf
    • https://xaydungkienthiet.com/upload/files/zitisipatovu.pdf
    • https://latrinquette.com/upload/editor/file/wutinideroxasowekiwewewa.pdf
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/30664096649.pdf
    • https://jagamimpi.com/contents/files/14777108913.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/ledukanidapov.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/885adb5dfa2e9087982a4d40ed15beb4/xogakuwozowomadajit.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hnajdcsu71lndp7pk2ueuam484/lefajizonad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=f2+movie+download+tamilrockers
    • 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_off0000af5a.bin
aba4d2364bf5eeab023f533bc7a1f27c10f07a0bc3d7cca3ce2015d7d81af30b
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5A 15560 bytes
font_01_sfnt_off0000d65f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 16792 bytes
font_02_sfnt_off0000ee76.bin
d8ba09ebdb2b910b5d858f05f57662491b94b2bd72782eda8c896487c6d7b7cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 10872 bytes