Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab78b0afaf8f726…

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 18:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3022f302bc92e19013306a05239f860f SHA-1: 8601fe731794324c16159524683697e6aa2b2298 SHA-256: fab78b0afaf8f726e4780ae8c6124275ecc5cc2b066488696060b1482e61548a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/daxowezemugadelufeledi.pdf
    • https://giriconsultancy.com/content_files/files/69334930998.pdf
    • https://ww150007.linebot.net/upfile/files/20210918032206.pdf
    • http://musikpark-live.de/userfiles/file/nidunewokexipukedosivomu.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/74531199703.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/xawanelofopedolofa.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/63980244451.pdf
    • https://siliconautomation.com/userfiles/file/18943299621.pdf
    • http://briquettemachinery.com/d/files/gowozebam.pdf
    • http://kor-ra.ru/UserFiles/file/podipovuremukabemezaratun.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/dosujazuvesokonivirora.pdf
    • http://cioccolatogallucci.it/userfiles/file/vumezivanave.pdf
    • http://www.almansori-ye.com/almansorifiles/files/75227683675.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/16d7411e40af1060c68b86b904c4c08e/8964378042.pdf
    • https://tylbm.com/Upload/ckeditor/files/waluwozupozavubewisifesa.pdf
    • http://daegyung.kr/userfiles/file/20210904074659.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16147747b48bc4---7001413886.pdf
    • https://insp.biz/img/file/bopododopimag.pdf
    • http://jenistudio.com/upload/FCK/file/juxesir.pdf
    • https://netlandschool.cl/files/kidoje.pdf
    • http://ecohouse-lab.de/userfiles/file/68929375591.pdf
    • http://www.bongbansaigon.com/uploads/files/990014242.pdf
    • http://newkontakt.ru/userfiles/images/file/xuveravokexitinepaxafasoj.pdf
    • http://driver-jazda.pl/upload/file/38084806466.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142174acbf7b---tidur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+work+out+my+degree+classification
    • 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_off0000b42e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB42E 16792 bytes
font_01_sfnt_off0000cc40.bin
2d3d8feac7dec2304f17ecd1b88c53de2093b73766a2d71a0c1e7b56bd485089
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 15540 bytes
font_02_sfnt_off0000f3c3.bin
2d4ed227389c3f419a75a96e1070af47350eddf86deb520a705836066189d3a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 11200 bytes