Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d6bb4aa7c9fe74…

MALICIOUS

PDF

79.7 KB Created: 2021-08-20 01:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f27bb4f0fd364b906ee991d72f1809b3 SHA-1: 6403a21a3643055040ec08271a30e9b98de3b374 SHA-256: 19d6bb4aa7c9fe74e7ad5c97b0753b1fb2e138dc084e438df271d042d7f7eab7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF that impersonates a cloud document service, a common lure for phishing attacks. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://intrigantka.ru/images/userfiles/file/46223997952.pdf
    • http://allg-gyn.ch/userfiles/file/79417952723.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c720a77ff---zupadufuzanoxonugor.pdf
    • http://acril.ru/ufiles/files/gonusexarovuzifugegim.pdf
    • http://12shio5.com/contents//files/kinazopedenogelika.pdf
    • https://magerp.org/upload/files/vefexebe.pdf
    • http://157.230.241.115/image/upload/File/27928846811.pdf
    • http://viprealestatebrokers.com/userfiles/files/dapemizemusuj.pdf
    • https://a2designbg.com/userfiles/file/67802465822.pdf
    • http://yacpa.org/yacpafiles/file/xepexesibalepugebojered.pdf
    • https://jphotographyllc.com/userfiles/file/30082630999.pdf
    • https://protradingindia.net/userfiles/file/53833284879.pdf
    • http://masan315.net/board/imagefile/file/liposutezimajowa.pdf
    • http://sensi-leszno.pl/userfiles/file/86512656101.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f0f86cc69b15438e9a0b757e63eba25e/96957246654.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/rh57o8f7l5t58op14vd25agvo2/gunisuxudavobudadanopi.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f49750cd8ae3b0ae158efacc3aa9aa9c/labovedusirevowufuv.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/17084403409.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b29c28f10b40c0c5399aaffc606bf4e2/norulatizisuluw.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8e887243adce444f306a10b6daf6f094/jatasedadimisakafulixev.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609067c706ef2---luzimol.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103e86e671f---sinexosob.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/89549982701.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+autocad+2019+convert+pdf+to+dwg
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21e.bin
2644aec956b3ae3fd0b841862738604a2097e4d6e5ab74b4cbd289a0a25b2ee0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 11232 bytes
font_01_sfnt_off0000ec92.bin
4d0f663a92e7cf32d145862cfcf043f589854d1e2beec4386638d5eeed16a27a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 16604 bytes
font_02_sfnt_off00011813.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 16792 bytes