Malicious PDF — malware analysis report

Static analysis result for SHA-256 558b187fb9f48db5…

MALICIOUS

PDF

73.7 KB Created: 2021-07-07 06:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6778d1ab29dc40f00bae6071f95df2e3 SHA-1: 37230a5cac060dab11f1e2c00eb80593d186bee8 SHA-256: 558b187fb9f48db57900cecc33d8e870b46843476b55af01b0a221817728d09a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, such as http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5baf70ec59b87ca8801f2e1f91966bac/87924102322.pdf, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27883488d---wofosupis.pdf In PDF document text
    • https://bluza-shop.ru/content/File/tekokod.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/12683366491.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608319e2195f4---norolesevufusipep.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8b6999b0---mopolidazem.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hi9f9dpvcrb8u9t2chopn91254/77051356953.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7d9470881f60315cfbef8e78b9e3048c/boruxuregesemosaxi.pdfIn PDF document text
    • http://teknis.it/userfiles/files/96856854472.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/safadixa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad07996cf8---luzozejazazasemisu.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/nifirovumupunojedanapene.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5baf70ec59b87ca8801f2e1f91966bac/87924102322.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/wujunomunirodezekapazono.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ca85b499dcfd34f18e37b72d257165b6/70667297541.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac8c23eb5---61591238969.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40657afd50---8388232567.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4be8f1f4b015f66df4d477cc8108035f/690347332.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/5480660760.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fbcc2929d---9698711942.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9c6dcfc5---jakulojabaz.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/notowetiwidisufeda.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-23/20210523173314802364.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9h6rl4ttet55hgtvdtdmp7snm1/biwuguwomuge.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8eb30493d---36292410644.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fa05777d96a3a2c7fcd109b45b939025/xonamasisitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=friends+mother+nudePDF 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_off0000c0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 10384 bytes
SHA-256: 88b42c5f29a6ec628ef059165c4b18298d29b9da759ed9072d110e7e2b698062
font_02_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16108 bytes
SHA-256: a7b5962fe510ca5fd9fd37c0bff430241069fed04949d28ed2217006468e8887