Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cd7d8fa4bf6128…

MALICIOUS

PDF

86.3 KB Created: 2021-07-28 01:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af6db999acf459b908e59de0859667f1 SHA-1: 32b94d592398ca72f63ab2c50a1ca587e62371eb SHA-256: 86cd7d8fa4bf6128806b3f34d68bae65a6e390ccc450c90f18460833ffa51857
204 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of an advance-fee scam. It contains multiple links to compromised CMS upload storage and disposable hosting, likely serving as a link farm to distribute malicious content. The document's structure and heuristic firings suggest it is designed to trick users into downloading a payload by presenting a fake lottery or prize notification with a download call-to-action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160824cd5cfebd---48099688494.pdf
    • http://akcjonariusz.com/UserFiles/file/wexofuradomapava.pdf
    • http://atdawnwelift.com/userfiles/file/dezevimodibujupudisur.pdf
    • https://circolodelpistone.ch/userfiles/file/8950897102.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/82425d38f12bc3d09b6332f9cd363596/golibibufuxa.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/90a99d29bc959de0ed2cc1a7c77ddbff/9952355474.pdf
    • http://195exim.com/datas/files/xifazukajelejenenul.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/40792040731.pdf
    • https://guclupin.com/calisma2/files/uploads/virowimepixajowaso.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0541efac1---16591916367.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/bb0091f5e42ad195f017a2fc66aec06b/zibagenegu.pdf
    • http://zjpjxt.cn/upload/uploadfile/file/lavizi.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202106222202167765.pdf
    • https://cvsc.co/userfiles/file/bekonumowodukoki.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a376f7ed96a---javugubejemiwijoraborap.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/69c3ee5d7858f1dfb65158db5447953c/wemugefuwodulanu.pdf
    • https://aulacvn.com/upload/fck/file/donusatifowo.pdf
    • http://heninrealty.com/userfiles/files/31281374073.pdf
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/luwewefubifajupumix.pdf
    • http://nolimitscenter.be/peausitive/images/FCKeditor/file/xusumovupumutik.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a137133734---76690603055.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0d87fb8b---34920279431.pdf
    • http://pobierzplik.pl/uploads/files/15550596904.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=classic+bomberman+hack+mod+apk
    • 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_off0000e9f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
font_01_sfnt_off00010209.bin
269a97d2ecd9fd6a1975c91a3e02a32fe02b221c406f8bbddd19a362bdc610eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 19324 bytes
font_02_sfnt_off000132ee.bin
18eeb9284aa0a0db5da6e64f43215606b42403ddce61435dc0f34691bcfd8990
pdf-font-stream PDF embedded font (sfnt) at offset 0x132EE 10944 bytes