Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d32128034053de8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 00:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 827469b9b17b6d19194e1e4d26b1aab3 SHA-1: 11b604080ed84d4c4238fab08ea447b05fa84439 SHA-256: 7d32128034053de89ad328b05147d0d30c9d227175433e1a82a4fe40946dec27
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically flagged as phishing and trojan activity. The presence of multiple external links suggests the PDF's primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=mini+militia+mod+apk+by+android+1 PDF link annotation
    • http://www.hangmandigital.com/files/file/759939124.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/dejebu.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/dapakopalo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd6e557bb---84554334989.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/nozuwifobazekanetelenugot.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/natasojokadi.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/rulojivipadowur.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/giwito.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/68227119116.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9abb4914e---jevisivabaxemirenisu.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/disakomimux.pdfPDF link annotation
    • https://alev.az/userfiles/file/sodafupagewapafumikewim.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/51728761294.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/55426584057.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/66342710a9ffeb41f36014ae7412c447/lataxisuk.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/vugepujirarajodoluwiga.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d4a315fc---fufagizixebagefuli.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/fepajibagebojelesob.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161315f2943d03---pezumefemivaxire.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/17249162360.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/wemonesalivaji.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/6793023869.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/86505192680.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/gupupekajubobuwap.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 18772 bytes
SHA-256: ec0dcbc6fa49e142c74370beb004f94a1d565b098409516051521dc9139dba16
font_01_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 10644 bytes
SHA-256: 39fa5da5f25a81ccc7307c2e803250bfc840315fd546c256f37bd129a3125ec9
font_02_sfnt_off00013151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1