Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b252c466f8f134…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 01:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 640ec18bb54ce34b00f65750734ecc09 SHA-1: 4db43df46467f7253356442e5984ef5fa007090a SHA-256: b7b252c466f8f1345c58ad0a3e56d6c5b24cd9089ded723abd7ac570e2223bf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to manipulate search engine rankings or lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and URL distribution suggest it's part of a phishing or SEO poisoning campaign.

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://lustigersteirer.at/userfiles/file/munomu.pdf In PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/37989i6ds34ihcatmahbpi3l1j/gegoj.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adcfadde89a---boxevobutigegewipis.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/99465423016.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8ef6d4344---maxotetatofupamawiv.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081804341573499.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dd4f816c2b605baa811ff48bf609a0d/kipedabukapisaxavesa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pinewibafukerunoka.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/icu8rk6csa9mic9ir674lidqu8/lalumixogilotekenulo.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/vibizoliroralivuputetugo.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/mevotakebovawimikupavemaf.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812b26e0b1c---79403080442.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vspsltf1ou12ksvgbb9upjfa90/8129366223.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ac6ba772b4425c3904e39402c5764c57/xanega.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/nuzebu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f2b79398de975b6fe8367ef1698245ac/12239817494.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/61594390396.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076445ee4a13---52572173686.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/sewarof.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee937b9c1---49174116470.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/89662987825.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/57012188031.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/wigudur.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/76162882297.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210822185309.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f81junbtgcodud4mq8je3cs952/89116294314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=exercices+conjugaison+present+imparfait+futur+simple+pdfPDF 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_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 19192 bytes
SHA-256: ff3c7c11b153f7a133e26180ffdbf598ab9cde1a6046cf81e1c6919a77d6f04a
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 11276 bytes
SHA-256: 71c2cb17a54741f730573b7d8c3d9d3ae8c48dc4ad9158778b3493dd2a6b8178
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1