Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16f1255614bdc0c…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 07:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cd706e71d73f9d8d5ffac9a4a4a8f7c SHA-1: 360bb465fd7fd54b36e485381ba9bc85ea3176e0 SHA-256: a16f1255614bdc0cd0e14f2de34919ec8e10e3b4f1d7f22e16639b7a3ac93d1b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs, while numerous, are primarily used for redirection, and no specific script execution was observed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://baoholaodong24.com/userfiles/file/paxifufowijurojo.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8760b4e7---49209263878.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/7bdqqkb1k72jjbl50qsk78qb85/nusekogega.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/32af3c3495c8cb9e85ede651826a4696/nexikarawidoterox.pdf
    • http://alnadaoil.com/userfiles/file/balowiwowemuwafobi.pdf
    • https://pellevah.com/upload/files/luditox.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/8jk4kf8p91abte43l5d86c2947/fedodugonisizitalirim.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608358203258d---baziluferadizunaras.pdf
    • https://etonbio.com/newsLetters/images/file/89019387339.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/5gso1t4smuio6guhjs31v39927/masefudaf.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/663a9df78151dd02a679d6e7bbaae9a6/fosaxajaw.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092200623957---wiseligotesuxavufita.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9bd07a23---guwubitigoreti.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091888179b24---vonuzolotipitaten.pdf
    • http://hanasushipickup.com/uploads/files/sojudeleroxevibufed.pdf
    • http://akcjonariusz.com/UserFiles/file/linatisimovukodemito.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210626224428_964293367.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1ab0178d1216a93932b2746f8a243f73/27329157188.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/844d130cf6084672eb7487ad9b135269/52631210520.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4f2465e39900fe009c7ccffc24103935/11161314348.pdf
    • http://orchid-daikanyama.com/userfiles/file/mevamoxukavijesajixuz.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826e9a8abb9---jajuxipizale.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7663e622---65862089092.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bible+verses+about+church+unity
    • 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_off0000f00e.bin
49a3dfc23f84d6d2faed40640a51db1742ddccaf4b7deb48e7b723cc6b52001a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 16868 bytes
font_01_sfnt_off00011bcb.bin
1f3c8d34fe3e32999ee6718dc67c852c51f112b1fa14e03827f50d0bc2afbe57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10800 bytes
font_02_sfnt_off000134b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 16792 bytes

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