Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f13a445a70b0eb7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 18:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc89766a3356e42e04e1c471118693c7 SHA-1: cfd18654a129dc5d98e42ad304c9416a51990151 SHA-256: 7f13a445a70b0eb71bce63cda04236891a97b695e68a2f62d5f0af75e32f29cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://biomax.shop/filespath/files/20210904102506.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613189f6a7ec4---51056632114.pdf
    • http://zaintik.org/files/galeria/files/66885416269.pdf
    • http://avtokit116.ru/!upload/files/xoximaluwi.pdf
    • http://moyamoya.center/images/hand_uploaded/files/89117890430.pdf
    • https://begili.com/uploads/image/files/tazakojuxobawewuvix.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f819ad0ec6---55769270565.pdf
    • https://speak82.com/_UploadFile/Images/file/gevonenefik.pdf
    • http://hoya889.com/upfile/files/20210911130756.pdf
    • http://pibar.tw/uploads/files/202109072333539618.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130319515dc5---29937795914.pdf
    • https://kapefashion.com/files/files/jofiler.pdf
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/vikiv.pdf
    • http://abpjseah.news-read.com/upload/files/20581184101.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/14328aa7c3cb8370f2397588edec0f85/ramov.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/xerusupu.pdf
    • http://refinerlink.com/userfiles/file/feronowom.pdf
    • http://petgears.com/app/webroot/files/file/57137026734.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdf894991f---fitegiz.pdf
    • http://ingegnasrl.com/userfiles/files/japonojafetopez.pdf
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63296658880.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/zajigume.pdf
    • https://akproauto.net/nbloom/fckuploads/file/vazevotivudeka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gemcraft+labyrinth+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c86e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 16792 bytes
font_01_sfnt_off0000e085.bin
d953fdc9bfb3a082414a890af1d648e9a88ffd94950d43b1fcc78c063e43d497
pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 10868 bytes
font_02_sfnt_off0000f968.bin
978d23f43fea8c739684a291d0c49ec5590155b7380b05ac7b77220bd9ff3430
pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 21468 bytes
font_03_sfnt_off00013076.bin
d707e3381d1825b7537f622e28c3d5e47799795c638ace14622acd2dafed2c05
pdf-font-stream PDF embedded font (sfnt) at offset 0x13076 16284 bytes