Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad57068ce435d666…

MALICIOUS

PDF

100.9 KB Created: 2021-07-09 19:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b74c948fbc518fecb16904d7cb8427e9 SHA-1: 43de2e64043a0f36d0df723d1582029fcda2150d SHA-256: ad57068ce435d6666243a98f05de21bdaea397b6e7371800330115d40e47a77f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the document is a link farm, with many links pointing to compromised WordPress uploads and disposable hosting, suggesting it's used for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d70f455058---revajigakejeratupugun.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/xajimutepitavapu.pdf
    • https://anyimaker.com/upload/users/files/durabupiluturow.pdf
    • http://achilleferolla.it/userfiles/files/3196367820.pdf
    • http://txextremecarts.com/userfiles/file/wanofexozuvunopivegape.pdf
    • http://wirheiraten.de/images/file/noropus.pdf
    • http://sweetbasketsbyjackie.com/clients/864293/File/97257908076.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075658e45058---xotijasixilereka.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160919b85d8da1---moduxulanaxejuwip.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jr9a7vtkc1kv9gda1nr6gbp4a2/ropegiwasolopiwopeji.pdf
    • https://skvacations.com/userfiles/file/73382950675.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/16dc5f15c64bc6c2105dcc406e84256c/9184539391.pdf
    • http://aroma--style.net/files/files/93189795865.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e6ae1c55---92726966312.pdf
    • http://playbabydoll.com/userfiles/file/21383093414.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/cltraubjm6jkmtkuteg5k2c72e/8770094970.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb82972308---potubusaxujuliren.pdf
    • http://technoculture.cz/admin/upload/file/75762951973.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/26114666285.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8fd71575---44176444247.pdf
    • http://kyanite.tv/userfiles/file/benam.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b3d0f992---35642018126.pdf
    • http://solamsys.com/userData/board/file/marew.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf81f6fdbf---25620071975.pdf
    • http://ahxxzx.com/userfiles/202105/file/76539608677.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a497dc8dd---69514027819.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=candied+yams+with+maple+syrup
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104af.bin
ff0fd87d79cdc020cdef8625582f006b61fbe0573252a93424ec120d87075997
pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 17600 bytes
font_01_sfnt_off000132ee.bin
d8e53d637cfe9f81bf53566e421a865c85feb983f053a5b79989390c9d922deb
pdf-font-stream PDF embedded font (sfnt) at offset 0x132EE 16968 bytes
font_02_sfnt_off00014b8b.bin
065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8B 1824 bytes
font_03_sfnt_off0001541d.bin
9165f954733e9e4e56805e09fb394e726314fcd032f17848adf55e37f58aa826
pdf-font-stream PDF embedded font (sfnt) at offset 0x1541D 10868 bytes
font_04_sfnt_off00016d18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D18 16792 bytes