Malicious PDF — malware analysis report

Static analysis result for SHA-256 e870f573821013d6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 03:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba933e3acc3786291443decceddbd02a SHA-1: 1b649a71dc0c9e3b14550689493fde2ef5e47846 SHA-256: e870f573821013d667f17eb01179101617f6059c99fae53fbeb3700c5a5cbf09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, including WordPress installations, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9344ef1---41339118144.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5edc0851f4775a18e9ec2aafefea8676/jowaseranevofok.pdf
    • http://leton.pl/userfiles/file/65777345321.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/dolokubanaxuximifumobu.pdf
    • http://fsgzb.com/upfolder/e/files/20210901070047.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/68299369718.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/843c895617f24ecdd8338db06c3dcbd4/70256754207.pdf
    • https://motodubai.com/uploaded_images/files/zaxapefowedo.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/88762715887.pdf
    • https://seo-methodes.com/userfiles/file/pusorikiramutile.pdf
    • http://weilandvloeren.nl/fckimages/lokedoxi.pdf
    • http://yves-segers.be/userfiles/files/gexepapi.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c61fbaa85d234bb940182c4d549b4e34/dafogajuwuwu.pdf
    • http://abwmercury.com/uploads/files/82312210953.pdf
    • http://wecans.net/_UploadFile/Images/file/12535532581.pdf
    • http://shijijiaming.net/filespath/files/20210902190339.pdf
    • https://estatecambodia.com/htdocs/cljr/data/files/lerugiguremenonap.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/84d9107bcbc95932fc93b5c17d104bbb/sufivolobajemonoba.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/finufuz.pdf
    • http://nhadatv.com/webroot/img/files/95717829947.pdf
    • http://krevue.cz/UserFiles/File/74738533868.pdf
    • http://clinical-pain.com/pds/userfiles/files/soziwumawubuzunuleduk.pdf
    • https://vietrocknet.org/app/webroot/img/files/tilonibadapusufipalo.pdf
    • http://qtjdb.com/UploadFile/2021/09/04/file/20210904_165555_119.pdf
    • http://hagelkonzept.de/userfiles/file/sakuwabipewilosojemas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=range+of+visible+light
    • https://b2cdemo.tickets.com/content/files/pajapojedotetesavu.pdf
    • 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_off0000dac1.bin
c83f6cab96d70ba3b7c5a1c27ed6fa6aa50eecdc14633ac9ebc245c680c98c09
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 10644 bytes
font_01_sfnt_off0000f31b.bin
c236ef14565c916f8b5449ac9b652f013c5abcd392b438da4063c1aa431541c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 17964 bytes
font_02_sfnt_off00012221.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 16792 bytes