Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ca0d30d019c8b2…

MALICIOUS

PDF

79.9 KB Created: 2021-06-29 00:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 337eff7a745ab10a79955034d44be88c SHA-1: 44a2154eae175414947bc953d3747d7ca9ef113f SHA-256: a7ca0d30d019c8b2dc14d7c07100032e93457827a604d977c188f420d937b4e5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to potentially harmful content. The PDF structure and embedded URLs align with phishing or content-luring attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/7f5d635ba669ecf13044dd25c590b89e/76708000667.pdf
    • https://anfauglir.com/images/file/tikojotirezin.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6fa988cf9a46316604df4bee6ef81f72/78744678059.pdf
    • https://sport-jicin.cz/dokumenty/noxedukatifubu.pdf
    • http://marcth.pl/media/fck/file/4783194026.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/d5e78c6ed3cd1683e1f614606d01a46e/jonikomirefosakuluvafubo.pdf
    • http://altaprecision.com/userfiles/file/bufotaloweja.pdf
    • https://nilsahost.com/calisma2/files/uploads/bajiredodunomulenuxe.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160945f0194dc6---96438023996.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/s7bush8q6c62aot3op8jaqt2k5/6746753605.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b4d901e7cc9aac83c3092a25f2b5c404/deputisebovozarepexalaj.pdf
    • http://archi1919.com/smlclub-files/file/84768697863.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab55507bab---51972271500.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/tavisakef.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609114f1e4cc0---rapukunanez.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b46728e49f8---51359225962.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/757107e3b7a124d91b05b6c9deab6cf9/vetatofizikugikuv.pdf
    • http://chnli.tw/CKEdit/upload/files/45665625394.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743d7662f97---35065543824.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/f749a782834b1fd91b65aa75ec3b2073/jodupopajedabumonelaxol.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2367bacea78fe9090f251dec0495fca1/dufizotigofovevidume.pdf
    • https://gregor-biffiger.ch/userfiles/file/pirabimutipexefusepo.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/07b49111c250faa0bd4c20822a9dce05/vujeserevi.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08204bb52e---robamoviru.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=intense+hide+and+seek+battle+naruto
    • 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_off0000d411.bin
1d590b2491d3dc59953fe29ac5c932cebc429572eaf417520c91720a7f74903d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 18356 bytes
font_01_sfnt_off00010227.bin
0232c933c9aa84590ca8de8ee005cb758541cc3f3dce4082307f9a5327c42053
pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 10628 bytes
font_02_sfnt_off00011a5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5D 16792 bytes