Malicious PDF — malware analysis report

Static analysis result for SHA-256 509100c2e1940974…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 23:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9be2bdf4f06de5b34bfbbcf0769a712d SHA-1: f50ddb17936fc440a1cea6fb3204303a8db2e544 SHA-256: 509100c2e19409749f655471b94ac714046fb6583d839ea088646f3069a41481
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/982b9b93f718735e1d0e6cd85518ab39/rawoxobozoxolipuwa.pdf In PDF document text
    • http://holidayinntorino.com/userfiles/files/naririzugud.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ufvrv18ek72e7s6cdpo72lk53e/12003632005.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb80135e296---34536546767.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/7418954756.pdfIn PDF document text
    • http://noelex22.org/userfiles/file/17889636692.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/30938495898.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202108271816047676.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d887772b527---wimefozetatifinudewakovi.pdfIn PDF document text
    • http://splogservice.ru/content/files/78096551072.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/rozedolafararu.pdfIn PDF document text
    • https://penal-garazh.ru/files/panejipele.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/31373270119.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/8107200478.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/18797902370.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/04b78ee26f6dac5608c1422d101ae286/xewufulotewomitib.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/39083612550.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/45500273509.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/71474546740.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/wunatazarag.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/89115947192.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/99476434806.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/73540104388.pdfIn PDF document text
    • http://josquin-capella.de/download/54384306460.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/nutawet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=denyo+generator+service+manualPDF 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_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 10856 bytes
SHA-256: 9ff49700d2a45899eefd12d8116886aad1f964a4bfa0120ffd3e9f4a94353bd3
font_01_sfnt_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 16328 bytes
SHA-256: b7934f1ee09f5cfcaa305c3807eb28f005495ebf821403cb5d3d296a2299f0a1