Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d834cd3d8b0b4db…

MALICIOUS

PDF

100.0 KB Created: 2021-07-29 14:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4bcb86fcb45a1f700dc53e447ca33e8f SHA-1: 34c043220f7bc656449a2df76f3655c44a223705 SHA-256: 4d834cd3d8b0b4db4acaf0ee7ba7fcde1d49467b977c4b3edf3410e8810ff691
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://0-50.ru/userfiles/file/73315059960.pdf In PDF document text
    • http://carzip.biz/files/uploads/files/20207879290.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/divcnh6rjissnbn3hhjjjkh94c/92872591998.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e785188b1---94038602071.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/kmniphkg3ifp4mdgbf4f1fbker/zujunesodizajim.pdfIn PDF document text
    • http://polipack.ru/content/file/75637438496.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/eefu74qvirfqo106dojbffkb2r/xisizaxeperukifu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tfqm8c5j77ejmbhtsijjuqtfu7/72224416003.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/usg17td5jdig3f55jkhulkbk14/87543011507.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/28434197676.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/zinarega.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa38e70ada---49532755113.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1cc7019f725da46ff0b0c58b7d38a729/pewonow.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/gj1m3416k8tiq42dohm4uj079k/rujinidogerolewenuzef.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/momikapigawodu.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/38620984209.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852318badd8---bozepukofijo.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/79586539523.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c25a1f6e---jutodagulifajinawu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddef5b2b95f---fapopudalox.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210520080826_3lxcg2.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5655d089---xowiranaw.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdedb0c47d---fagel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+much+do+navy+doctors+makePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001214b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 17836 bytes
SHA-256: 887e398f680eceb03103a83d834fda42b60ac9e01ae5fed7be89f12e4582e028
font_01_sfnt_off00015067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001687e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687E 10944 bytes
SHA-256: 8bf5bf364106a112f00145095cc2d1f219dcaed5d2496019ebb6633fedad3bef

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