Malicious PDF — malware analysis report

Static analysis result for SHA-256 70aa1674ea3bbb99…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 17:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7fd90bb219a0bcbbf2473d864211ada SHA-1: 775eeeda091b0b4d80ceda1eac84859579d1c44e SHA-256: 70aa1674ea3bbb992b8a87f9c59fb71729e4ab25d72dfa1cdf0d7e5418fb7c49
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. This suggests the PDF is likely used for phishing or to distribute further malware by luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://coretry.ru/uplcv?utm_term=sony+ten+3+hd+live+streaming PDF link annotation
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80360421963.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/subewofovejewolefekuga.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc1836edb---giduwikevi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144d77f6305e---10905338566.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jlvkt67ukl8sspdf2s4bj7o1c9/43479946054.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47d8bdc7f---wevudovukalegudor.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/vuxabediwi.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/89033520435.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/vasudevobenijije.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexesenadogopulupid.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/72032276321.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/zowalabamexonadow.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b15454dc2513252982344fbca5d0c306/9305349928.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210902103512.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/55242489489.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/zutuxiwawekerin.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/miriwubowux.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/65533646782.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/4393511877.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6d1398ec---wujebizilafubafonag.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/nidikunelasakuwukubukawe.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/28226175364.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144590ab012d---88574884806.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/nizefisof.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/fubidugunalekuduberetod.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/41087490901.pdfIn PDF document text
    • 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_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 11120 bytes
SHA-256: c9e267c4f856086ede15d4750bd8018ea67581bfff9c699bedda21f300cb6680
font_01_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 17476 bytes
SHA-256: 0c3b745dcc6df6748bf67c168637e43753a2005d9b327c741b0b2d8b2becb987

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