Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57fc9606fdef9b8…

MALICIOUS

PDF

113.8 KB Created: 2021-06-26 20:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61078730332f6a37f1af193aea3dcbee SHA-1: c3ecead7d3bdb4d4f851b535d492281522482daf SHA-256: b57fc9606fdef9b86bba71792dedcda6407729839661506844dda517cf15706d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0nedkhclc6qjt7dugpeqdeq0t3/ladupunezad.pdf
    • https://aneri12.eu/res/file/duxorurejixu.pdf
    • https://clumba-indoor.ru/files/files/8895307162.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28cae5528---6136516475.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f8b531d0---lukitovewilirurinew.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/fe42b0f52436812bb659d17e1e026d00/54882014594.pdf
    • http://unsersohn.ch/images/file/24656540281.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a752a8d9db469619ce29a1796e1f1e40/jizifasusol.pdf
    • http://myblindz.com/fck_user_files/file/22421478249.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93a36312a---golaweketepajujabizitofa.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/38a0a016e24d92bd95bc4820ecc99d4a/56159558604.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fh6nksegdjp3lmsbumdrc14vg0/90128450356.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8626a10bff---vidiwelusuxakedapirade.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3916e87dd8---54670988072.pdf
    • http://richmediahouse.com/admin/uploads/file/76498028785.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/r2dmkfsnutsltd6irmc1ko0k37/duvovejo.pdf
    • http://svsteinfurth.de/radsportfiles/file/48394325926.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4253303d5---68063211100.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/ac337c89a6fe4ac7f74622e26b98d042/12329432816.pdf
    • http://asja-doll.ru/userfiles/file/94212392360.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e968981a---rewetumesid.pdf
    • http://bdn10.cz/files/file/sixajuleneba.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rosewood+episode+guide
    • 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_off00015a07.bin
c978562271da74601d358e1b4d60582354575623ecc2351c6be6f72fcfb792d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A07 18492 bytes
font_01_sfnt_off00018ac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18AC8 16792 bytes
font_02_sfnt_off0001a2df.bin
179a640382d85183f7851cb8a718550a9bf243636f079d7622e7663c22a45e59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2DF 10288 bytes