Malicious PDF — malware analysis report

Static analysis result for SHA-256 919a72bee8171830…

MALICIOUS

PDF

106.2 KB Created: 2021-06-14 05:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b786795f8c269d0c989ad015ff60ea30 SHA-1: 934dcd409f755e7802fbde1b7d40d30c22ff3f0e SHA-256: 919a72bee8171830145ebb1b285ebe5af252b0dbb01d2e28edbfc0a610fa363f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://archism.ru/uplcv?utm_term=ayat+al+kursi+english+transliteration
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905c40eeb30---datipaxu.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7ffc25c301b7808252c98b9b94c32351/tuwakirisor.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fe43de75158f8c37f30700c9b3e24f0f/tovukinulafibutozasufilu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e90f494f1---20630850343.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c712e652ff---27068943624.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ad701b4cc00787415279ac830ca2a000/welojiperumexijofawofu.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ph7m3fjf39nqb577509nca45kc/8503939400.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e1f37aea4---1670910671.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcaa7a289---fizonireludotigusuruvexat.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rloaeeablvkgcifivdhr53inl1/takinepowukew.pdf
    • http://atthaya.com/file_media/file_image/file/88079379074.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608501cc9ed3c---93964301869.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55fae349b---32313439373.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qk0tk4dfjulkmpnlli2fa4gili/24991139905.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d78708d1---xikuzezavesofopav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00015b87.bin
7a728123a37b51b3428ce5b69d8a619f98cf3a7f859fdbbbb1dcba58be7bc86c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B87 27008 bytes
font_00_sfnt_off00010033.bin
c4055df0960568c9fe7516bf10d74b7eca9e6decca272c1ff1f25f8e7bfefc38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 7000 bytes
font_01_sfnt_off000111c7.bin
bdfe56a89a68cac9565b5b76e8b186e24189856a27de1dd77094496521d8e028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 4984 bytes
font_02_sfnt_off000122b0.bin
0c59cf4a56aea98a92c82361c4e9e701c4bef86ed58f5238313be2ef5b106715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 5148 bytes
font_03_sfnt_off00013383.bin
9febc70f68fc3544ffab8538dd794059e97fb71480695d4060e6141e7dcebe87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 12288 bytes
font_05_sfnt_off00018be3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18BE3 4324 bytes

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