Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6f19c46cb50408…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 17:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bda00fb69a27bfc5cb5e5db34f63724 SHA-1: ae51c151713f99f4a2e2fe8d4e8cd0d3cfb2af56 SHA-256: 1b6f19c46cb504080f913a6b9a9b3c25ee7013654b62d8a27c0b186eb1601880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The embedded URLs, while numerous, do not appear to directly execute code, but rather serve as entry points to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc43ac7fb7---nijufabonoperiruwexo.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b77409c5563---ninaritagemazuratipaxovi.pdf
    • http://hy-concrete.ru/d/files/wixasopabegof.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b96bf0733726dcdf27a07668437998d1/reseledijube.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bcpv7q6j534fkrmpdlhkf4jgr2/kuvomepokububosalefefajor.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160875fc7cfbe1---18546753544.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6782f3050---44695545329.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/525a5e3a08a75542788ff04e7d915e5a/detojekugofewozal.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b7635f209---54203976748.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608937ab441e5---zoseti.pdf
    • http://webinside.pl/userfiles/file/wajujifezuvilekekafejere.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e6e62259c425b299c5c879026df98826/83849536015.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/galenuribojidaw.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160900a73b2184---janowewoguxonejamisitifaw.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/49b3f3bcb598f2474b328e820cc9ad3d/93682315648.pdf
    • http://0-50.ru/userfiles/file/28709880786.pdf
    • https://led7.ru/file/mumun.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5315b0e60f---zejumaxigiwop.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/88885804182.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a569e1fb1fd6f3bb02f163a724b179b7/gazupufimuperimobuvipuw.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qhmoits48r530tqdv2nsp5oeb2/sibamurin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087836ad0d9f---diwefevefikijo.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjvqf7tgilph04p0ntevp8hkri/zufebuxubegifejujebumi.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/21056b9f3c5d44d6d4f5ee7ece297547/73142148045.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=it%27s+not+your+fault+but+mine+and+it+was+your+heart+on+the+line+lyrics
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db34.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB34 16160 bytes
font_01_sfnt_off0000f0a9.bin
5c70eeae3c9186cf6a9bf66ae82ce09c37fd1b8abd230bed3acc355a8111b163		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 18048 bytes
font_02_sfnt_off00011f54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 16792 bytes
font_03_sfnt_off0001376b.bin
70bf5a855e5d96a1d7ef9b49d1b3c11d8436acbd692209250c03d5a818940911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 11168 bytes

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