Malicious PDF — malware analysis report

Static analysis result for SHA-256 557099ee08459331…

MALICIOUS

PDF

114.2 KB Created: 2021-08-01 08:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e67374ea9cf858f6ee7b2866986126de SHA-1: 027acc9f83dba0318092b465f696106fe26a5226 SHA-256: 557099ee084593310ceea5a70db06aa8a6641fbd8c11042ec2d348e732aa24cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=catit+water+fountain+directions PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/21a45658def863d11455e3a089abe4c0/nabamitupenij.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/romitegadetibos.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/20816400093.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/beputiditizuwefomadubino.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/femijivobitar.pdfIn PDF document text
    • http://alkanboya.com/files/file///1923138358.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/23355100446.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/dimidujor.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/74666928813.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/5047601655.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db2d914f5aa---rotajawijajosiva.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/gelogamozavafubituzujame.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/96372963296.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/pevejew.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/96761377206.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/23040794163.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/rojigafafanaxoxidagon.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/11743769843.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89e3286de---45770554960.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16091937e42488---dojeribeduwagokenixujer.pdfPDF link annotation
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084aef84431c---11412048029.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5c9ktdvs5d0v50uvu7pacnbch9/xaruxekesolawodebigomi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/37524820367.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/xoxutabuxudugapajaji.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e5902de7a---xakasazema.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 44908 bytes
SHA-256: b68693e8325513edd639dd196a3dfe8d359ba3f2cc31c80a3de1bba78ff65196
font_02_sfnt_off00015c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C35 16264 bytes
SHA-256: 913c9ce91f63aa9811ec013d01449fcf552681ac2cf545d05421fe0eb59abe7d
font_03_sfnt_off0001722e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722E 17660 bytes
SHA-256: 39049ef95e0c570442f1fe0b3bf083451197c134003d9f064ff96190f61bf07e
font_04_sfnt_off0001a043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A043 10640 bytes
SHA-256: c41e80f8257666385faf9bcce5e0f6995537a27c7d16104a3633a7d2c13936f2