Malicious PDF — malware analysis report

Static analysis result for SHA-256 7548a07533887add…

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 22:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a46dc13a2cfe52ea4f9e681468558faa SHA-1: a16ccde95937ba2545d6afe25b33fdb375f3b5c2 SHA-256: 7548a07533887add12e6855b55e5f197c379d7f2a10c9f5ceb33c34f246617c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as a link farm to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://sushigonewildtogo.com/uploads/files/57657250412.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58fd9f60a---89103361631.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a366027f042---35407524322.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85806d72c---vamisoped.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/dikolano.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3gp3ps3mci1rbkjd3qv9d22k6p/5186486061.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043002081578.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c5673595---renegopidiru.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c351389005b---15688254386.pdfIn PDF document text
    • https://ekransamara.ru/files/84361125505.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wemuwexowabogeraxetox.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/io56bmn0tbbs83df831g0kk6s0/garopafigojepege.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/34942282111.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/moravizikewegemoruromum.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ca174b993b4e4f9e51d9126c0145ec64/zutewunego.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f288e6d25a---90084601312.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b285face737---mimafozawojakinulogomi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc7e7c74c---41475007602.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/degatudapinanetute.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/febarutedidoregutokofikak.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/nofimagurifijaj.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062409243644.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/57454353990.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a998f879f0d---denegazarofejuteva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tc+count+in+bloodPDF 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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 17060 bytes
SHA-256: 640539679be61315fc88986548a9846cc3438f10fcc53354d85160696a16bf5e
font_01_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 10004 bytes
SHA-256: 9f62c490ec03347f95bf4bf2fb8d22ce9a031f2ffea7a17a04aaa7a75d35ec50
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1