Malicious PDF — malware analysis report

Static analysis result for SHA-256 e436b2cd86cd7196…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 03:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 417418e3e76c7e0159ebab8c3086b031 SHA-1: 619cd6cbb5fef93cd57ff27e820deba2991e7e03 SHA-256: e436b2cd86cd7196ed2c376f55cf1f1c62b33faa104ff053a95061dbb0dd4173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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://coebmsf.com/userfiles/file/49005700937.pdf In PDF document text
    • http://dolphinkorea.com/files/files/rafopawovemaxadufalel.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/jevogideteroz.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/eb9888678c21d6d10586334ed9e3ad6f/jusabasofak.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/97049608178.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd4f752bbb---82322379373.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/37191198577.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a108f669c6---gasufosujutixilabor.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/28494957401.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/91108115780.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7dbc39f12---25815461984.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/jasaxazepuzebizefikuk.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/72253652137.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/92605135424.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/47309838122.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/bigedagagerege.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141a022adaed---xutogolufoxibot.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/vowegimafumoroke.pdfIn PDF document text
    • http://rayer.cn/d/files/84354921371.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/5930479759.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210902191812.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/40306264547.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/weranesidajumenutireje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=different+types+of+lines+in+geometryPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 19500 bytes
SHA-256: bd72239ad479c1e606c78d083ea3b8c4d157558605d7e7cebc20255a9efb8780
font_01_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13434 10656 bytes
SHA-256: a55cd3aec0a1d568ee4d94ce7a21aad3a5669c351f4a005998ed6f39db1e75dd

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