Malicious PDF — malware analysis report

Static analysis result for SHA-256 587262d429fd3557…

MALICIOUS

PDF

84.7 KB Created: 2021-05-09 02:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 23904a088714b1d3218cdd60bf681922 SHA-1: 9d164d8a2b8d4821a3ca2bb0929f79dc93e14ab6 SHA-256: 587262d429fd3557721d4b62a669b6db8bae36a269487aac802b0d0d953046b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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 https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/abfc580555d885ae1e96fd4d75061fb1/14499916268.pdf In PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/011f0a95d297084585b24f1d4bc364a0/rabawogej.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/44e4rvai8famrm0n7l1icin9g0/63155423302.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/06de7d58e5e232978e911748e985a4e3/vodekajitagimagudukog.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/58320891672.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d49adbade4c9ae481c7459a513e0b91/sekipedikapisefod.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095061ba259a---89814240332.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/7b34uadl0jv7taf6hg5nc6kllv/73878094832.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/xowif.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b217c709e2---jasawetutevowarulubewi.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/gb5eln6j288oihq7e61tpnmm39/50817915600.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/18f67ecef72cda03a75467452a09fc02/12278225865.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3262d3cc---zeniwagatowutifef.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9ba603ef---zupadene.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc17843384---jexufifatenotazitobud.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf84ec4907---duxofuwefagu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7aa04e367---manuwedamezozijak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+pie+vs+miui+10PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 3804 bytes
SHA-256: 04454c1305eb61feb6a3caedc3473940d85625f56a2139c9b487d9ddc988b34b
font_01_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 5108 bytes
SHA-256: 795f92085e3433db8fc9d0caef21d469882c7e2439496b04fc9be1055ab3bd04
font_02_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 5836 bytes
SHA-256: aaf6c9ebe1860a1068632f9a80592de94d94d7df88fbb325b6d40599c08123a6
font_03_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 16640 bytes
SHA-256: 5d44512182f9a556c6130fc6ada8a843cd11ef8b5f601e99c6fba90a6cd5980f
font_04_sfnt_off00012d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D16 16316 bytes
SHA-256: 2d9a9b97e503d4e02a2e67bac07359bf4857352068cd7146d5303ea4de3dfc5a

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