Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93d184cf73ed0d9…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 08:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c0f5143422531511bbee6d1ff6ab3aa SHA-1: 7884be271ad4dd4ec4901cf7fa02e8195f1beb4a SHA-256: a93d184cf73ed0d9f085f7c54e3e130a85c7d9d18190e632b48a036e503eaf12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Multiple heuristics indicate the presence of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=tiphaine+samoyault+a+intertextualidade+pdf PDF link annotation
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f55c3314---42110460880.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/34367938629.pdfIn PDF document text
    • http://adice-area.com/pictures/files/25242059823.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/64660990542.pdfIn PDF document text
    • http://asfalon.com/__files/file/96315138317.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/34472602413.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/24062384134.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/40788159765.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lakamu.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/42670818874.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/40405629995.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/18224662902.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1ed7cdcdd447494f0b3ebedecf18870c/58261481233.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6b847a444---segolefodi.pdfIn PDF document text
    • http://18554080.com/userfiles/file/salokabejosof.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/71335958911.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c9d0c90c00c04a4d1150b01218289019/dibubuwoxegikesevozageda.pdfIn PDF document text
    • http://szpk.hu/_user/file/sexozajaf.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/71823712804.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941fe5125aa---61337352829.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b711ddd308f---74700457051.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608361a3035a6---gixaxesukirurufofijolove.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/24294337915.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/xisilomuvewujunezikubeki.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/84063483436.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_off0000c516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 18856 bytes
SHA-256: 1dc923a7d7ea16e3dfb5919b43297272b2cba0e84b09eba45d48e476cb64d4ce
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 11044 bytes
SHA-256: 85673c8a9f1730b9592a4d4eb61b6b30168070b240217ec10a28dcd6359d424e