Malicious PDF — malware analysis report

Static analysis result for SHA-256 955c33af846db342…

MALICIOUS

PDF

88.9 KB Created: 2021-09-10 22:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 298db67684a519deca32c9c7908dba08 SHA-1: cb2ccf45d9c1838687ba0c3586b0c74eafef388e SHA-256: 955c33af846db342ae9ad011fd1a41de82dbb5e52b804a25206674b758b4d074
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of 'utm_term_redirector=True' suggests an attempt to manipulate search engine results or user navigation for malicious purposes. No scripts were extracted, and the document body was unreadable binary data, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://cwpni.com/userData/ebizro_board/file/xoxibuwa.pdf In PDF document text
    • http://ashole.hu/UserFiles/File/15183259185.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/vuwup.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/50467670255.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qljnglt1uj90j0lltq8uniktt0/5676507721.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zovafidekupaj.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/20723329544.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6060048971.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/62552924231.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/doragunuxijexenabomi.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/bubikeboniravoj.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/monovijigifel.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/54346916811.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/58708222628.pdfIn PDF document text
    • http://totoumi.jp/upload/file/zesor.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130db585a1e3---kaweloxewukupapugo.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/fowugibefagegoro.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6861727b---33058068232.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161325cfb00e8c---roluxe.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/kujezogipagalipoxabaxej.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tifiwanezujunudikusim.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/3687291767.pdfIn PDF document text
    • https://swiz.eu/files/editor/54993441525.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/94319377603.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/32455637326.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/pitoribu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=aladdin+full+movie+originalPDF 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_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 19732 bytes
SHA-256: bdde706844b834aba65c92c9b67dd365eaa58409b2d0c545c65c90e744bbb038
font_02_sfnt_off00013dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 10580 bytes
SHA-256: 196119789961dde331fa96c6fa9efc45aefe50192d4ec7c46967ec91bd3dfe22