Malicious PDF — malware analysis report

Static analysis result for SHA-256 815ecac1cd633dbf…

MALICIOUS

PDF

91.4 KB Created: 2021-07-06 00:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e32c3111da8b7891fe81631706ebdd3 SHA-1: eb2d7822a9f11c0789c998035de6f86ee82596b1 SHA-256: 815ecac1cd633dbf7158486db3125501f4edec725689f15e5cb4f21766321db3
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links are likely used to host phishing pages or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a4b32a4b65f8f69226ffc5e0a22905e1/19548673998.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b982adc5530---51380616758.pdf
    • http://atthaya.com/file_media/file_image/file/lugadigererusaxesijijozu.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/764b21d8bc6ba675ab5ad7b27d796b2e/fateletobowotowonevu.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45edf18d9---towewobesavaru.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3723846c78cbfaa394b781d9771295b8/17367437189.pdf
    • https://bodegoncriollo.com/userfiles/file/71363045219.pdf
    • http://cobansut.com/userfiles/file/filijuxenijijiboxeli.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc66ccf8c---basipig.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/277eaf1db67a0be920f16daf33228db6/kofogewufuguves.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d77dba9c150d6c30661fec28ccc12cd3/gudipisab.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/djulnh111bajkch5hksiskh4c0/lepoxut.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2cb83300c---95664749265.pdf
    • https://beldaoyun.com/calisma2/files/uploads/mazimusubudod.pdf
    • http://bbfederico2.net/userfiles/file/nonuvipoxebugifewitex.pdf
    • https://mamo-tato.ro/userfiles/file/67169926615.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/99d7430eedf97cf83fabc7ef43f037eb/govil.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba30114af89---mexuwosunizakop.pdf
    • http://modnyi-buket.ru/uploads/files/wipufalopidaburosojofo.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18577533601.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a5aaefa42---67738674318.pdf
    • http://agnieszkapawlik.com/userfiles/file/piziwezoteveruwonoraja.pdf
    • http://bycongroup.com/UserFiles/file/banigi.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dfd55d5c0---xaror.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608642807babb---monasamilarumibuzefe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=comic+drawing+reference
    • 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_off00010183.bin
1ee580a29665a3b397ea2a9a70f3811dadb5ca757c04e22711aba671694aa0df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10624 bytes
font_01_sfnt_off0001199e.bin
0d43c717818346506de64bf432c4974171ba0684c0a9f80779d5412d3036d83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 17392 bytes
font_02_sfnt_off000146e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146E2 16792 bytes

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