Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcc8c957925eb76…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 04:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f74d461bffe41f3f9abddd9016b94a4e SHA-1: 48e733e093c5e5adb79a7a46c48b91519be9ac01 SHA-256: adcc8c957925eb76065943740463ec6d2b5a43ce8a266cb83f357a0f931aed50
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://crewmak.ru/uplcv?utm_term=pixel+6+dual+sim PDF link annotation
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925362c455---roxavawavagiwasim.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/nujibemadenijosotuna.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/kowiwapupoxojavonukidulo.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/kugipezogiwi.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/dababexavomugetezilufas.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58898032334.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/gobusawixipopitoz.pdfIn PDF document text
    • http://cocoal.com/uploads/file/nepubason.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/48477885097.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/vupufaruvewaniwukulewalip.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/xewob.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305e7cd6fba---63399420552.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/81669978561.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378aef7723d---jojobovaxak.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161358b9f70111---56564276807.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/labeli.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/xodofomesifedaded.pdfIn PDF document text
    • http://tayles.com/uploaded/30883945491.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904122425127.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c854b12c---64041767610.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/71541200670.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/kulakulatisabijefaroxegi.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/tiwejor.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_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 17856 bytes
SHA-256: 781ea49dd2de3337d2056ebf32b80ca3865b79483bdbe4b0dc1dc8b09c8009f2
font_02_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 10356 bytes
SHA-256: 887ea62811d80aca4b8f982ec14b331b53591066fb4ba84853d0431603c6ffbb

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