Malicious PDF — malware analysis report

Static analysis result for SHA-256 3574190ba2801c4b…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 12:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f739d52aff7c558e2072c31ce7b98522 SHA-1: 9929199c8301f49083c1b942a6513bced13f13c3 SHA-256: 3574190ba2801c4b08d105d97d60acb49fddde60b334dce1183e91aee9dab46f
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://zuche0551.com/upload/file/71422915335.pdf
    • https://muzeumkonstancina.pl/attachments/file/rimufigemat.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2aefdca21---gewugisinejuwusifijawil.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/sobajomineranoxiwotuv.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i7vek578kmp8cgj2a00agaokvq/dujiminoxutetezujadu.pdf
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/88144453106.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086084559d72---murepojogal.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c637c88bd---tixopuwux.pdf
    • https://fratellifurloni.it/file/82505220707.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5qkufdk73h9j7h01s32bpdotq6/31886922277.pdf
    • http://sola-brothers.com/userfiles/file/ridozakapiku.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0pvkqrpht8jnvfa0tkf4e1d8pc/98635717462.pdf
    • http://shinex-auto.com/userfiles/file/77149994394.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be048ac13ee---gomaz.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/m1l7nhhg5fh8qutpn6g1sgqj92/fuvedup.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b76a4a51005---91359697435.pdf
    • http://haenuri.net/ckupload/files/42346772214.pdf
    • http://kawoka.com/userfiles/file/2535672443.pdf
    • http://rentbucharest.net/images/userfiles/72247757218.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f63ec9b1ed0be51672ffc3d49352f411/bedurejofezisasoza.pdf
    • http://akcjonariusz.com/UserFiles/file/pafepuxuwesixugumawudube.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/5993320927.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f01ebbf36f18dbfc6e1e8c9cc23a2810/kajavudubodizefadarax.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/36463968f8db5d4e72c9d4354a5396e4/10124313707.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcd53368a---lebasotop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=god+is+in+the+rain+meaning
    • 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_off0000eadc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16792 bytes
font_01_sfnt_off000102ee.bin
a3444b115cfd43af732af29893c69bcaa8042b8c71e64c31f37eedd9f097eb32
pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 16992 bytes
font_02_sfnt_off00012f01.bin
181a6e97381cc15dca5359f4f072c6d25bd067c75e4f9885234dad995fda68fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10688 bytes