Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1c1ab9d92370ec…

MALICIOUS

PDF

70.2 KB Created: 2021-09-05 04:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87d2a8ab65a5040eb2a888211ef2e769 SHA-1: 89195fe6f55254efd7b9b0befbbf3e64e0987836 SHA-256: ca1c1ab9d92370ecf6246df2d883fec202d0e23578d9c3ccd8c96d953580921f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are often used to host phishing pages or distribute further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement with malicious links.

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 https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e94517f0a53a7c0a9eab6b49f1dec109/xipojinakovifadiloka.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/fe7884d38199d251810430f49b77e33d/99286892709.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8303e4818---84552918206.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0bc55e8c94e4f2ced50eb6d316da1e2b/41108432267.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a386015a817266ae60f0a77069f8b3d4/zubevim.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/tabosuxuvexuzejafikumof.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/favabetilimojarebi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/eq9df1s9u4oeur2fgpqqo6rfnt/zuvibijamebejujidevusexa.pdfIn PDF document text
    • http://citty.org/images/uploads/file/77224561717.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/10363898699.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/48098242221.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/53229013385.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608244c3d07ad---noxepuv.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/29292218698.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1183797498612f13366047a.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/772df56f678d769065dc143f874b0a89/99622152606.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/fefulekapawi.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/gawudazanot.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/33e618c82a1c2dc555930b5d361da17f/78445672886.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/noralor.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c681ed3b3160bc3dd507b81428189f0c/jekubizifosovaritaxika.pdfIn PDF document text
    • http://gptools.net/userfiles/file/15534067480.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/77506998352.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/81584862580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=french+numbers+worksheet+printablePDF 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_off0000b562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB562 14544 bytes
SHA-256: 6a83fbae787e264bb0afc0dbe3b8bed6aa1183bbee61fdb2052dd91472725189
font_01_sfnt_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 11036 bytes
SHA-256: 3df48b306fb033ff8072150e3cb9b9d161afba9b8361cd1d7d5dc507e3b928bf
font_02_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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