Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c0a0dc2ff0f176…

MALICIOUS

PDF

78.3 KB Created: 2021-07-27 13:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9af8c0c13efc7e12a65b3cece048abd9 SHA-1: f10040b1fca5ba88e1682fa04a7d4f03223e3c86 SHA-256: 66c0a0dc2ff0f1765e93536649a56a43e3c7999531a6b1ab3e249f5b6b58934e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised websites and potentially disposable hosting, with one URL explicitly mentioning 'crack adobe cc reddit'. This suggests a phishing or malware distribution scheme disguised as a software crack resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/39352ffe2f3d664db5ddbb340cfd608b/setef.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f507e00a---bomeduponebunopiluve.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/66788626656.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fimoxevolibupefagisuw.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210515085204_09mkwp.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160df7efaf0db9---zifenogenisivemalo.pdfIn PDF document text
    • https://plasy.com/uploads/file/11313956540.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ucvb5vde3cat0tlpi2ouhn5h5j/nimowodesotulitemitijuxik.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/63496903741.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/wegumanupovadigad.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021624113016.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072a41f812dc---49360581125.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/10177603904.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6cqlsq6go1so8gbokn3col9di0/9185752629.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bitumojaledegukojekibetis.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee4730e60---terexuba.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/908004196.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c3f0eef4a7d10326d394d34cb76d44c0/8329207379.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/dikeleraxin.pdfIn PDF document text
    • https://turbooto.vn/upload/files/vutebetepop.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c88e7deb1---keropozezukugubukugusopu.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/koviroxozimo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/42bphhf2kgugon3grvupf0e8v3/mepofekov.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f843287d4219b671d77bb53dc9bcc737/7175571325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=crack+adobe+cc+redditPDF 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_off0000d03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 10308 bytes
SHA-256: 6fd0bbaa02364cb99e996a76a0e0341223e93b0751d03752135ef8664e974c4f
font_01_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 16776 bytes
SHA-256: 16b9d81d77add07887aa5d74391971b5c07737ce86f6e1e67cc78dca77155564
font_02_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1